feat: warn when using --unstable, prefer granular flags (#21452)

This commit deprecates "--unstable" flag. 

When "--unstable" flag is encountered a warning like this is printed:
```
The `--unstable` flag is deprecated, use granular `--unstable-*` flags instead.
Learn more at: https://docs.deno.com/runtime/manual/tools/unstable_flags
```
When "--unstable" flag is used and an unstable API is called an
additional warning like this is printed for each API call:
```
The `Deno.dlopen` API was used with `--unstable` flag. The `--unstable` flag is deprecated, use granular `--unstable-ffi` instead. 
Learn more at: https://docs.deno.com/runtime/manual/tools/unstable_flags
```
When no "--unstable-*" flag is provided and an unstable API is called
following
warning is issued before exiting:
```
Unstable API 'Deno.dlopen'. The `--unstable-ffi` flag must be provided.
```

---------

Signed-off-by: Divy Srivastava <dj.srivastava23@gmail.com>
Signed-off-by: Bartek Iwańczuk <biwanczuk@gmail.com>
Co-authored-by: Divy Srivastava <dj.srivastava23@gmail.com>
Co-authored-by: Asher Gomez <ashersaupingomez@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/cli/tests/integration/lint_tests.rs b/cli/tests/integration/lint_tests.rs
index e131df713..b266fb5b7 100644
--- a/cli/tests/integration/lint_tests.rs
+++ b/cli/tests/integration/lint_tests.rs
@@ -4,7 +4,7 @@ use test_util::assert_contains;
 use test_util::TestContextBuilder;
 
 itest!(ignore_unexplicit_files {
-  args: "lint --unstable --ignore=./",
+  args: "lint --ignore=./",
   output_str: Some("error: No target files found.\n"),
   exit_code: 1,
 });