CI: add script for installing NodeJS and update it to v20

[Kobzol]

I centralized the installation on a single place to make it simple to update the NodeJS version across the board.

Fixes: #123965

r? @Mark-Simulacrum

[bors]

☔ The latest upstream changes (presumably #123978) made this pull request unmergeable. Please resolve the merge conflicts.

[Kobzol]

Rebased.

[Mark-Simulacrum]

@bors r+ rollup=iffy

[bors]

📌 Commit a920ed4 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

[bors]

⌛ Testing commit a920ed4 with merge 426a698...

[bors]

☀️ Test successful - checks-actions
Approved by: Mark-Simulacrum
Pushing 426a698 to master...

[rust-timer]

Finished benchmarking commit (426a698): comparison URL.

Overall result: ✅ improvements - no action needed

@rustbot label: -perf-regression

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.3%	[-0.3%, -0.3%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-0.3%	[-0.3%, -0.3%]	1

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	8.5%	[8.5%, 8.5%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	8.5%	[8.5%, 8.5%]	1

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 671.572s -> 673.693s (0.32%)
Artifact size: 315.28 MiB -> 315.30 MiB (0.01%)