fix(amazonq): Prevent customization override if user has manually selected a customization

[spfink]

Problem

If a user was part of an AB group with a customization override, they could only ever use the customization from the override regardless of personal choice.

Solution

Changes the logic for when a customization will be overridden if the user is part of an AB group that has a customization override. With this change, if the user has manually selected a customization, it will not be overridden by the AB customization.

---

• Treat all work as PUBLIC. Private feature/x branches will not be squash-merged at release time.
• Your code changes must meet the guidelines in CONTRIBUTING.md.
• License: I confirm that my contribution is made under the terms of the Apache 2.0 license.

[Will-ShaoHua]

i feel it's better to have sinon.stub(FeatureConfigProvider, 'getFeature').returns(featureCustomization) here as well

[Will-ShaoHua]

to simulate the real case when there is an override and user pre-selected customization

[spfink]

Added to beforeEach so it's present for all tests

[Will-ShaoHua]

thanks for adding test coverage

[Hweinstock]

Is there a more concise way to describe this change in the PR title?

from lint-commits:

Invalid pull request title: `fix(amazonq): Change logic for customization override to not override if user has manually selected a customization`

* Problem: invalid subject (must be <=100 chars)
* Expected format: `type(scope): subject...`
    * type: one of (build, ci, config, deps, docs, feat, fix, perf, refactor, revert, style, telemetry, test, types)
    * scope: lowercase, <30 chars
    * subject: must be <[10](https://github.com/aws/aws-toolkit-vscode/actions/runs/12660729822/job/35287038708?pr=6316#step:5:11)0 chars
    * documentation: https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#pull-request-title
* Hint: *close and re-open the PR* to re-trigger CI (after fixing the PR title).

[hayemaxi]

Suggested change

	"description": "Change logic for customization override to not override if user has manually selected a customization"
	"description": "User-selected customizations are sometimes not being persisted."

or similar, see https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#changelog

[spfink]

Updated

[spfink]

Lots of connection resets in the test runs today, will try another push to see if we can get them running again but they are passing locally and passed previously.

[hayemaxi]

/retryBuilds