test(fmt,internal,cli/unstable): fix test failures with NO_COLOR

[miso-devel]

Fixes #7322.

When NO_COLOR is set, the implementation correctly disables colored output. However, several tests in fmt, internal, and cli always expect ANSI escape codes, so they fail depending on the caller's environment.

This PR makes those tests explicitly enable colors instead of relying on the environment. It uses stubProperty to set Deno.noColor to false. For modules that capture the setting at initialization, the tests use dynamic imports so the stub is applied before the modules are loaded. For code that reads the setting at runtime, the stub is applied within the relevant tests.

Testing

Ran each test file individually with NO_COLOR=1 before and after the changes:

NO_COLOR=1 deno test --no-lock fmt/colors_test.ts
NO_COLOR=1 deno test --no-lock --allow-run internal/styles_test.ts
NO_COLOR=1 deno test --no-lock cli/unstable_spinner_test.ts
NO_COLOR=1 deno test --no-lock fmt/printf_test.ts

Test file	Before	After
fmt/colors_test.ts	1 passed, 53 failed	54 passed, 0 failed
internal/styles_test.ts	2 passed, 10 failed	12 passed, 0 failed
cli/unstable_spinner_test.ts	3 passed, 8 failed (9 failed steps)	11 passed (9 steps), 0 failed
fmt/printf_test.ts	32 passed, 1 failed	33 passed, 0 failed

The existing noColor subprocess test passed both before and after the changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.04%. Comparing base (f834d02) to head (7dc3b2c).

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #7334    +/-   ##
========================================
  Coverage   95.04%   95.04%            
========================================
  Files         619      618     -1     
  Lines       52012    51757   -255     
  Branches     9450     9401    -49     
========================================
- Hits        49434    49192   -242     
+ Misses       2031     2022     -9     
+ Partials      547      543     -4     

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