[TASK] Allow additional composer options for `-s composerInstall`

[DanielSiepmann]

This change modifies the Build/Script/runTests.sh command dispatcher to allow passing composer options to the composer install subcommand, for example

Build/Scripts/runTests.sh -s composerInstall \ -- --prefer-source

Note that this is already possible using the generic -s composer dispatcher but would resolve some user confusion.

This aligns our implementation of runTests.sh with TYPO3 core, see: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84870

Resolves: #1346

[coveralls]

Pull Request Test Coverage Report for Build 10148203698

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 10147796747:	0.0%
Covered Lines:	46
Relevant Lines:	46

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💛 - Coveralls