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robobun 0b7aed1d0d fix(test): remove quotes from string variables in test.each (#23244 )

## Summary
Fixes #23206

When using `test.each` with object syntax and `$variable` interpolation,
string values were being quoted (e.g., `"apple"` instead of `apple`).
This didn't match the behavior of `%s` formatting or Jest's behavior.

## Changes
- Modified `formatLabel` in `src/bun.js/test/jest.zig` to check if the
value is a primitive string and use `toString()` instead of the
formatter with `quote_strings=true`
- Added regression test in `test/regression/issue/23206.test.ts`

## Example

**Before:**
```
test.each([
  { name: "apple" },
  { name: "banana" }
])("fruit #%# is $name", fruit => {
  // Test names were:
  // "fruit #0 is "apple""
  // "fruit #1 is "banana""
});
```

**After:**
```
test.each([
  { name: "apple" },
  { name: "banana" }
])("fruit #%# is $name", fruit => {
  // Test names are now:
  // "fruit #0 is apple"
  // "fruit #1 is banana"
});
```

## Test plan
- [x] Added regression test that verifies both `%s` and `$name` syntax
produce consistent output
- [x] Tested with `AGENT=0` - all tests pass
- [x] Verified other primitive types (numbers, booleans) still format
correctly
- [x] Verified complex objects still use proper formatting

This matches Jest's behavior after their fix:
https://github.com/jestjs/jest/issues/7689

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