Fix E2E tests

[pierlon]

Summary

Amends #6618.

This PR temporarily disables the nested-interactive Axe accessibility test rule to allow for the E2E tests to complete without errors. After downgrading the package-lock.json file to v1 in #6618, there have been 2 E2E tests on GitHub that have been erroneously failing which cannot be replicated locally.

The changes in this PR can be reverted once the LTS version on npm is bumped to v7, which is set to happen in the coming weeks.

Checklist

• My code is tested and passes existing tests.
• My code follows the Engineering Guidelines (updates are often made to the guidelines, check it out periodically).

[pierlon]

@delawski Are you replicate the failing E2E tests here?

[delawski]

@pierlon The tests pass for me both on node 14 and node 16:

[codecov]

Codecov Report

Merging #6620 (4e168ee) into develop (87f2ee3) will increase coverage by 0.12%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #6620      +/-   ##
=============================================
+ Coverage      76.42%   76.54%   +0.12%     
- Complexity      6288     6300      +12     
=============================================
  Files            195      246      +51     
  Lines          18918    19736     +818     
=============================================
+ Hits           14458    15107     +649     
- Misses          4460     4629     +169     

Flag	Coverage Δ
javascript	78.96% <ø> (?)
php	76.44% <ø> (+0.02%)	⬆️
unit	76.44% <ø> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
assets/src/common/constants.js	100.00% <0.00%> (ø)
assets/src/components/loading/index.js	100.00% <0.00%> (ø)
assets/src/components/dev-tools-toggle/index.js	80.00% <0.00%> (ø)
...validation/components/amp-document-status/index.js	100.00% <0.00%> (ø)
.../block-validation/hooks/use-amp-document-toggle.js	80.00% <0.00%> (ø)
...s/src/block-validation/components/sidebar/index.js	0.00% <0.00%> (ø)
assets/src/utils/use-window-width.js	80.00% <0.00%> (ø)
...ts/src/common/helpers/test/fixtures/mockClasses.js	100.00% <0.00%> (ø)
...lidation/components/invalid-block-outline/index.js	0.00% <0.00%> (ø)
...dation/hooks/use-validation-error-state-updates.js	85.29% <0.00%> (ø)
... and 43 more

[github-actions]

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