Reland "Refactor WebUITabStripContainerViewTest to InProcessBrowserTest"

This is a reland of commit 31035741e67d8d073007896abfb814288e58c880

Differences from the original CL:

The test cases have not changed, but we decided to exclude the relevant
tests from the `linux-blink-web-tests-force-accessibility-rel` tryjobs,
since the WebUI TabStrip tests are not activated in screen reader mode.

Cq-Include-Trybots: luci.chromium.try:linux-blink-web-tests-force-accessibility-rel

Original change's description:
> Refactor WebUITabStripContainerViewTest to InProcessBrowserTest
>
> 1. Refactored `WebUITabStripContainerViewTest` and related tests from
> unit test fixture to `InProcessBrowserTest`.
>
> 2. Removed all dependencies on `TestWithBrowserView`.
>
> 3. Refactored regression test to use `DevToolsWindowTesting` for real
> DevTools window creation and verification.
>
> 4. Some other useful cleanups.
>
> Bug: 417766643
> Change-Id: I7a6626999ac1304376b1aabbba7c63626b6890d7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6701930
> Commit-Queue: Ho Cheung <hocheung@chromium.org>
> Reviewed-by: Tom Lukaszewicz <tluk@chromium.org>
> Reviewed-by: Keren Zhu <kerenzhu@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1482433}

Bug: 417766643
Change-Id: I68e85cdb63a91778df51d730fc325ab0085ad7d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6701936
Reviewed-by: Keren Zhu <kerenzhu@chromium.org>
Commit-Queue: Ho Cheung <hocheung@chromium.org>
Reviewed-by: Tom Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1483557}