Simplify the hover replacement function

[eoghanmurray]

See #1458 and https://github.com/giuseppeg/postcss-pseudo-classes/blob/master/index.js for the full version; we didn't need all the features so we added if (pseudoToCheck !== ':hover') { but this PR goes further to reduce code.

[changeset-bot]

🦋 Changeset detected

Latest commit: 21407df

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 19 packages

Name	Type
rrweb-snapshot	Patch
rrweb	Patch
rrdom	Patch
rrdom-nodejs	Patch
rrweb-player	Patch
@rrweb/all	Patch
@rrweb/replay	Patch
@rrweb/record	Patch
@rrweb/types	Patch
@rrweb/packer	Patch
@rrweb/utils	Patch
@rrweb/web-extension	Patch
rrvideo	Patch
@rrweb/rrweb-plugin-console-record	Patch
@rrweb/rrweb-plugin-console-replay	Patch
@rrweb/rrweb-plugin-sequential-id-record	Patch
@rrweb/rrweb-plugin-sequential-id-replay	Patch
@rrweb/rrweb-plugin-canvas-webrtc-record	Patch
@rrweb/rrweb-plugin-canvas-webrtc-replay	Patch

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[eoghanmurray]

This PR has resulted in a test change which wasn't anticipated, however instead of reverting I believe updating the tests is actually the correct path!

We added the test in question in #1440 and it looks like the following:

body > ul :is(li:not(:first-of-type) a:hover, li:not(:first-of-type).active a) {background: red;}

The focus then was on ensuring that the above wasn't parsed as two separate selectors because of the internal comma (which is actually a comma of the :is expression). I think we missed that there was also a :hover in there which should mean that the whole selector should be duplicated. I've added a new test doesn't ignore :hover within :is brackets to formalize this expectation.

With the pseudoClassPlugin postcss plugin, and also in the version prior to that, everything between the brackets of :is was bundled with the :is, so the internal :hover was being ignored.