Use rocket scripts package for LCP Beacon

[wordpressfan]

Part of https://github.com/wp-media/wpr-inspector/issues/24

Here we are changing the way we generate the beacon scripts, so we created a new package here: https://github.com/wp-media/rocket-scripts to have the source code of beacon script(s) and build their files and here in WPR for example we will just copy the files from their dist into our js directory.

This will a lot in adding JS tests there, also will make WPR repo cleaner so any change needed in beacon scripts (and we may add more scripts in the future) so we will need to go to this repo and do whatever needed.

Todo

• Add unit tests for rocket-scripts repo
• Divide the beacon class into smaller modules to make it easier to create a new file that uses the current code.

[codacy-production]

Coverage summary from Codacy

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Coverage variation	Diff coverage
Report missing for d70151f1	✅ ∅ (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (d70151f)	Report Missing	Report Missing	Report Missing
Head commit (d8a3b49)	37376	14549	38.93%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#6771)	0	0	∅ (not applicable)

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[Khadreal]

LGTM

[Mai-Saad]

working as expected (note: e2e lcp when run altogether, mobile fails then running mobile scenario only passed)
testrail-report-618.pdf
PR6771 npm run test lcp.txt
PR6771 mobile only npm.txt