unreliable test: Amazon Q Feature Dev file-level accepts accept button button text shows "Accept all changes" when no files are accepted or rejected, and "Accept remaining changes" otherwise

## Test Details

- Name of test: Amazon Q Feature Dev file-level accepts accept button button text shows "Accept all changes" when no files are accepted or rejected, and "Accept remaining changes" otherwise
- OS of failure: Linux (E2E)
- VSCode version of failure (minimum/insider/stable): stable
- Link to failing run: https://github.com/aws/aws-toolkit-vscode/commit/a5129827b6af1edf738714eb5dbffcee2dce547e
- Link to failing test: https://github.com/aws/aws-toolkit-vscode/blob/d6be74245ff70d9708b8286d0eb9abaf5a63f0ad/packages/amazonq/test/e2e/amazonq/featureDev.test.ts#L295-L314

## Log of Test Failure
```
AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:

assert_1.default.ok(insertCodeButton.pillText === 'Accept remaining changes')

at Context. (test/e2e/amazonq/featureDev.test.ts:303:28)

+ expected - actual

-false
+true

```

## Additional Information

Start with packages/amazonq/test/e2e/amazonq/featureDev.test.ts at lines 295-314 and inspect the failing assertion at line 303. Run the linked Amazon Q Feature Dev E2E test on Linux, then verify that the accept button text is reliable for both the no-accepted-or-rejected-files and remaining-changes cases.

Written by the indexing model from the issue text.