feat(amazonq): Added basic chat tests & fixed nomenclature of clearChat util

[surajrdy-aws]

Problem

We have yet to implement the multiple chat test and the view history chat test. The clearChat abstraction can also be confusing to some individuals since the /clear command is different.

Solution

I have made the clearChat abstraction clearer in name so people do not get confused with the /clear command. Additionally, I have implemented the multipleChatTest and the viewHistory chat test.

---

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• 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.

[github-actions]

• This pull request implements a feat or fix, so it must include a changelog entry (unless the fix is for an unreleased feature). Review the changelog guidelines.
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  • If this is not a feature or fix, use an appropriate type from the title guidelines. For example, telemetry-only changes should use the telemetry type.

[laura-codess]

LGTM :)

[Hweinstock]

feature --> feat:

Invalid pull request title: `feature(amazonq): Added basic chat tests & fixed nomenclature of clearChat util`

* Problem: invalid type "feature"
* 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 <100 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).

[Hweinstock]

can we use a more descriptive label here? Usually each it is followed by an action. Ex. "allows user to add multiple tabs"

[surajrdy-aws]

Ah I see, didn't realize that! Will update all functions accordingly.

[Hweinstock]

same as above.

[Hweinstock]

nice, I like how this disambiguates between it clearing the entire chat window and the chat contents itself.