Tests broken in Chrome 93

[samouri]

summary
11 tests broke once our CI systems updated to Chrome 93. We should address this in two stages:

1. Skip all of the newly failing tests to unblock new code from merging (including a CP we'd like to get through). Skip new test failures after Chrome93 release #35900
2. Fix the broken tests and unskip them

skipped tests

• (8) Highlight handler
• (1) amp-pan-zoom
• (1) 3p ampcontext.js
• (1) iframe-transport-client

[samouri]

@dmanek: would you be interested in fixing all of the Highlight handler tests that failed as part of the Chrome 93 release? I started giving it a go in #35897, but think you may have better context.

I can take the rest

[dmanek]

Started looking into this, but seems like you have the highlight handlers tests covered in #35897.

[dmanek]

Highlight handler tests are fixed.

[stale]

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