Port streaming commands in bootstrap to BootstrapCommand and remove as_command_mut

[Shourya742]

This PR adds streaming capabilities to BootstrapCommand and migrate existing command streaming scenario's used in bootstrap.

r? @Kobzol

[Kobzol]

Thanks! Left a few comments.

[Kobzol]

#143354 (comment) :)

[Kobzol]

Thanks!

@bors r+ rollup=iffy

[bors]

📌 Commit 312de35 has been approved by Kobzol

It is now in the queue for this repository.

[bors]

⌛ Testing commit 312de35 with merge e804cd4...

[bors]

☀️ Test successful - checks-actions
Approved by: Kobzol
Pushing e804cd4 to master...

[github-actions]

What is this?

This is an experimental post-merge analysis report that shows differences in test outcomes between the merged PR and its parent PR.

Comparing febb10d (parent) -> e804cd4 (this PR)

Test differences

Show 4 test diffs

4 doctest diffs were found. These are ignored, as they are noisy.

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard e804cd4a5f1a5b658ddca245c80bef96a576c018 --output-dir test-dashboard

And then open test-dashboard/index.html in your browser to see an overview of all executed tests.

Job duration changes

1. x86_64-apple-2: 5488.2s -> 3965.9s (-27.7%)
2. i686-gnu-2: 6009.0s -> 5169.6s (-14.0%)
3. dist-x86_64-apple: 8322.1s -> 9367.2s (12.6%)
4. tidy: 67.6s -> 75.6s (12.0%)
5. i686-gnu-nopt-1: 7945.2s -> 7058.9s (-11.2%)
6. armhf-gnu: 5357.2s -> 4815.1s (-10.1%)
7. pr-check-1: 1762.7s -> 1587.7s (-9.9%)
8. dist-ohos-armv7: 3841.8s -> 4218.3s (9.8%)
9. x86_64-gnu-debug: 5933.1s -> 5380.1s (-9.3%)
10. x86_64-gnu-llvm-19-1: 3568.7s -> 3236.2s (-9.3%)

How to interpret the job duration changes?

Job durations can vary a lot, based on the actual runner instance
that executed the job, system noise, invalidated caches, etc. The table above is provided
mostly for t-infra members, for simpler debugging of potential CI slow-downs.

[rust-timer]

Finished benchmarking commit (e804cd4): comparison URL.

Overall result: ❌✅ regressions and improvements - no action needed

@rustbot label: -perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.0%	[0.0%, 0.0%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.4%	[-0.5%, -0.3%]	2
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (primary -0.4%, secondary 2.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	0.8%	[0.8%, 0.8%]	1
Regressions ❌ (secondary)	2.0%	[2.0%, 2.0%]	1
Improvements ✅ (primary)	-1.7%	[-1.7%, -1.7%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-0.4%	[-1.7%, 0.8%]	2

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: 460.756s -> 462.855s (0.46%)
Artifact size: 372.14 MiB -> 372.14 MiB (-0.00%)