🐛 [RUMF-1203] fix stopSessionReplayRecording instrumentation cleanup

[BenoitZugmeyer]

Motivation

As observed in #1397 , we badly instrument a few native methods in the recorder:

• cssStyleSheet.insertRule() and cssStyleSheet.deleteRule()
• some form input .value property setters

This causes unexpected behavior when calling stopSessionReplayRecording() after another library instrumented those.

Changes

• Use instrumentMethod on CssStyleSheet methods
• Implement and use instrumentSetter on input property setters

Testing

• Local
• Staging
• Unit
• End to end

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I have gone over the contributing documentation.