[BEAM-10775] Added nodejs installation and documented Typescript precommit job

[KevinGG]

1. Added nodejs installation in scripts because Node.js is needed by jlpm.
2. Added documentation of the typescript job to pull request template
   and README.

---

Thank you for your contribution! Follow this checklist to help us incorporate your contribution quickly and easily:

• Choose reviewer(s) and mention them in a comment (R: @username).
• Format the pull request title like [BEAM-XXX] Fixes bug in ApproximateQuantiles, where you replace BEAM-XXX with the appropriate JIRA issue, if applicable. This will automatically link the pull request to the issue.
• Update CHANGES.md with noteworthy changes.
• If this contribution is large, please file an Apache Individual Contributor License Agreement.

See the Contributor Guide for more tips on how to make review process smoother.

Post-Commit Tests Status (on master branch)

Lang	SDK	Dataflow	Flink	Samza	Spark	Twister2
Go		---		---		---
Java
Python				---		---
XLang		---		---		---

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website	Whitespace
Non-portable
Portable	---		---	---	---

See .test-infra/jenkins/README for trigger phrase, status and link of all Jenkins jobs.

GitHub Actions Tests Status (on master branch)

See CI.md for more information about GitHub Actions CI.

[KevinGG]

Run Typescript PreCommit

[KevinGG]

Run Typescript PreCommit

[KevinGG]

Run Typescript PreCommit

[KevinGG]

Run Typescript PreCommit

[KevinGG]

Run Typescript PreCommit

[KevinGG]

Run Typescript PreCommit

[codecov]

Codecov Report

Merging #12740 into master will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12740      +/-   ##
==========================================
- Coverage   40.22%   40.22%   -0.01%     
==========================================
  Files         454      454              
  Lines       53669    53670       +1     
==========================================
  Hits        21587    21587              
- Misses      32082    32083       +1     

Impacted Files	Coverage Δ
...beam/runners/interactive/background_caching_job.py	25.00% <0.00%> (-0.25%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update aa345db...63ce7fe. Read the comment docs.

[KevinGG]

Run Typescript PreCommit

[KevinGG]

Run Typescript PreCommit

[KevinGG]

Run Typescript PreCommit

[KevinGG]

Run Python PreCommit failed due to BEAM-10841.

This PR does not contain Python code change and the Typescript ("Run Typescript PreCommit") has passed.

[KevinGG]

R: @pabloem

PTAL, thx

[pabloem]

I am not ssure if we can run sudo on the jenkins workers? We can try and see what happens.

[KevinGG]

Yes, we can run sudo on Jenkins workers.

[pabloem]

LGTM. I'll merge in a bit.