E2E tests: update edit site button selector

[adimoldovan]

Proposed changes:

Update sector for edit button in broken site editor flow. We were using the button's aria label removed by Gutenberg with WordPress/gutenberg#47343

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

p1675896045693039-slack-C03QNBQKG73

Does this pull request change what data or activity we track or use?

no

Testing instructions:

• Subscribe block test passes with latest Gutenberg

[github-actions]

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