Migrate GUI colors test to original CSS color format

[GuillaumeGomez]

Follow-up of #111459.

r? @notriddle

[notriddle]

@bors r+

[bors]

📌 Commit f2f999e has been approved by notriddle

It is now in the queue for this repository.

[bors]

⌛ Testing commit f2f999e with merge 1e7d7facafebc9291cb7743b584d0794d98389ad...

[rust-log-analyzer]

The job aarch64-gnu failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

test [ui] tests/ui/traits/impl-different-num-params.rs ... ok
test [ui] tests/ui/traits/impl-method-mismatch.rs ... ok
test [ui] tests/ui/traits/default-method/xc.rs ... ok
test [ui] tests/ui/traits/impl-for-module.rs ... ok
##[error]The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.
test [ui] tests/ui/traits/impl_trait_as_trait_return_position.rs ... ok
test [ui] tests/ui/traits/impl-2.rs ... ok
test [ui] tests/ui/traits/impl-of-supertrait-has-wrong-lifetime-parameters.rs ... ok
test [ui] tests/ui/traits/inductive-overflow/lifetime.rs ... ok
---
test [ui] tests/ui/traits/new-solver/temporary-ambiguity.rs ... ok
test [ui] tests/ui/traits/new-solver/structural-resolve-field.rs ... ok
test [ui] tests/ui/traits/new-solver/two-projection-param-candidates-are-ambiguous.rs ... ok
test [ui] tests/ui/traits/new-solver/unsafe-auto-trait-impl.rs ... ok
Session terminated, killing shell... ...killed.
test [ui] tests/ui/traits/new-solver/unevaluated-const-impl-trait-ref.rs#fails ... ok
time="2023-08-21T00:02:39Z" level=error msg="error waiting for container: unexpected EOF"
##[error]The operation was canceled.

[bors]

💔 Test failed - checks-actions

[notriddle]

@bors retry

Didn’t fail in the test that was updated.

[bors]

⌛ Testing commit f2f999e with merge 8a562f9...

[bors]

☀️ Test successful - checks-actions
Approved by: notriddle
Pushing 8a562f9 to master...

[rust-timer]

Finished benchmarking commit (8a562f9): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

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

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)	1.4%	[1.4%, 1.4%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.7%	[-3.7%, -3.7%]	1
All ❌✅ (primary)	1.4%	[1.4%, 1.4%]	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: 636.639s -> 635.684s (-0.15%)
Artifact size: 346.94 MiB -> 347.04 MiB (0.03%)