Fix renaming symlinks on Windows

[ChrisDenton]

Previously we only detected mount points and not other types of links when determining reparse point behaviour.

Also added some tests to avoid this regressing again in the future.

[tgross35]

Great idea with read_link, r=me with the nit and a squash.

[ChrisDenton]

@bors r=tgross35

[bors]

📌 Commit 54b130a has been approved by tgross35

It is now in the queue for this repository.

[bors]

⌛ Testing commit 54b130a with merge 42591a4...

[bors]

☀️ Test successful - checks-actions
Approved by: tgross35
Pushing 42591a4 to master...

[rust-timer]

Finished benchmarking commit (42591a4): comparison URL.

Overall result: ✅ improvements - no action needed

@rustbot label: -perf-regression

Instruction count

This is the most reliable metric that we have; it was used to determine the overall result at the top of this comment. However, even this metric can sometimes exhibit noise.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.4%	[0.4%, 0.4%]	1
Improvements ✅ (primary)	-0.1%	[-0.2%, -0.1%]	3
Improvements ✅ (secondary)	-0.2%	[-0.4%, -0.1%]	8
All ❌✅ (primary)	-0.1%	[-0.2%, -0.1%]	3

Max RSS (memory usage)

Results (primary -1.1%, secondary 2.1%)

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)	1.3%	[1.3%, 1.3%]	1
Regressions ❌ (secondary)	2.1%	[1.7%, 2.6%]	4
Improvements ✅ (primary)	-2.4%	[-2.5%, -2.2%]	2
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-1.1%	[-2.5%, 1.3%]	3

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: 763.9s -> 765.869s (0.26%)
Artifact size: 330.55 MiB -> 330.63 MiB (0.02%)