Disable pipeline echo (#8292)

# Description

Change behavior of block evaluation to not print result of intermediate
commands.
Previously result of every but last pipeline in a block was printed to
stdout, and last one was returned

![image](https://user-images.githubusercontent.com/17511668/222550110-3f62fbed-432c-4b46-b9b1-4cb45a1f893e.png)
With this change results of intermediate pipelines are discarded after
they finish and the last one is returned as before:

![image](https://user-images.githubusercontent.com/17511668/222550346-f1e74f80-f6b6-4aa3-98d6-888ea4cb4915.png)
Now one should use `print` explicitly to print something to stdout

![image](https://user-images.githubusercontent.com/17511668/222923955-fda0d77b-41b4-4f91-a80f-12b0a1880c05.png)

**Note, that this behavior is not limited to functions!** The scope of
this change are all blocks. All of the below are executed as blocks and
thus exibited this behavior in the same way:

![image](https://user-images.githubusercontent.com/17511668/222924062-342c15de-4273-4bf5-8b39-fe6e3aa96076.png)

With this change outputs for all types of blocks are cleaned:

![image](https://user-images.githubusercontent.com/17511668/222924118-7d51c27e-04bb-43e5-8efe-38b484683bfe.png)


# User-Facing Changes

All types of blocks (function bodies, closures, `if` branches, `for` and
`loop` bodies e.t.c.) no longer print result of intermediate pipelines.

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

crates/nu-command/tests/commands/for_.rs

@@ -21,7 +21,7 @@ fn for_break_on_external_failed() {
         cwd: ".",
         r#"
         for i in 1..2 {
-            echo 1;
+            print 1;
             nu --testbin fail
         }"#
     );

crates/nu-command/tests/commands/loop_.rs

@@ -33,7 +33,7 @@ fn loop_break_on_external_failed() {
             } else {
                 $total += 1;
             }
-            echo 1;
+            print 1;
             nu --testbin fail;
         }"#
     );

crates/nu-command/tests/commands/open.rs

@@ -262,10 +262,10 @@ fn test_open_block_command() {
         r#"
             def "from blockcommandparser" [] { lines | split column ",|," }
             let values = (open sample.blockcommandparser)
-            echo ($values | get column1 | get 0)
-            echo ($values | get column2 | get 0)
-            echo ($values | get column1 | get 1)
-            echo ($values | get column2 | get 1)
+            print ($values | get column1 | get 0)
+            print ($values | get column2 | get 0)
+            print ($values | get column1 | get 1)
+            print ($values | get column2 | get 1)
         "#
     );
 

crates/nu-command/tests/commands/try_.rs

@@ -54,7 +54,7 @@ fn external_failed_should_be_caught() {
 fn loop_try_break_should_be_successful() {
     let output = nu!(
         cwd: ".",
-        "loop { try { echo 'successful'; break } catch { echo 'failed'; continue } }"
+        "loop { try { print 'successful'; break } catch { print 'failed'; continue } }"
     );
 
     assert_eq!(output.out, "successful");
@@ -66,7 +66,7 @@ fn loop_catch_break_should_show_failed() {
         cwd: ".",
         "loop {
             try { invalid 1;
-            continue; } catch { echo 'failed'; break }
+            continue; } catch { print 'failed'; break }
         }
         "
     );

crates/nu-command/tests/commands/while_.rs

@@ -26,7 +26,7 @@ fn while_auto_print_in_each_iteration() {
 fn while_break_on_external_failed() {
     let actual = nu!(
         cwd: ".",
-        "mut total = 0; while $total < 2 { $total = $total + 1; echo 1; nu --testbin fail }"
+        "mut total = 0; while $total < 2 { $total = $total + 1; print 1; nu --testbin fail }"
     );
     // Note: nu! macro auto replace "\n" and "\r\n" with ""
     // so our output will be `1`

crates/nu-command/tests/commands/with_env.rs

@@ -71,11 +71,11 @@ fn with_env_hides_variables_in_parent_scope() {
         cwd: "tests/fixtures/formats",
         r#"
         let-env FOO = "1"
-        echo $env.FOO
+        print $env.FOO
         with-env [FOO null] {
             echo $env.FOO
         }
-        echo $env.FOO
+        print $env.FOO
         "#
     );
 
@@ -88,9 +88,9 @@ fn with_env_shorthand_can_not_hide_variables() {
         cwd: "tests/fixtures/formats",
         r#"
         let-env FOO = "1"
-        echo $env.FOO
-        FOO=null echo $env.FOO
-        echo $env.FOO
+        print $env.FOO
+        FOO=null print $env.FOO
+        print $env.FOO
         "#
     );