tests: Mark some tests as slow and schedule them at the beginning #25614

Job	Run time
Paths filter	9s
Paths filter	9s
Check dependencies	1m 24s
Check dependencies	1m 24s
Test Rust stable / ubuntu-24.04	4m 50s
Test Rust stable / ubuntu-24.04	4m 50s
Test Rust stable / windows-latest	12m 25s
Test Rust stable / windows-latest	12m 40s
Lints with Rust stable	36s
Lints with Rust stable	36s
Test Rust ${{ matrix.rust_version }} / ${{ matrix.os }}	0s
Test Rust ${{ matrix.rust_version }} / ${{ matrix.os }}	0s
Test Rust stable / macos-14	3m 15s
Test Rust stable / macos-14	3m 15s
Lints with Rust beta	43s
Lints with Rust beta	43s
Test Rust nightly / ubuntu-24.04	4m 12s
Test Rust nightly / ubuntu-24.04	4m 12s
Lints with Rust nightly	44s
Lints with Rust nightly	44s
Test Rust beta / ubuntu-24.04	4m 19s
Test Rust beta / ubuntu-24.04	4m 19s
	1h 5m 29s

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