Allow BC check to install dev dependencies

[samdark]

Adds an optional install-development-dependencies input to the reusable BC workflow.\n\nWhen enabled, the workflow passes --install-development-dependencies to roave/backward-compatibility-check. This lets consumers compare packages whose released API references symbols from development dependencies, while keeping the current default behavior unchanged.\n\nNeeded by yiisoft/validator#797, where Roave otherwise reports skipped debug collector symbols from the compared release.

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Pull request overview

This PR extends the reusable backward-compatibility (BC) workflow by adding an optional input to allow installing development dependencies when running roave/backward-compatibility-check, enabling accurate comparisons for packages whose public API references symbols from dev dependencies.

Changes:

• Added a new install-development-dependencies boolean input to the reusable workflow.
• Updated the BC check command to conditionally pass --install-development-dependencies based on the new input.

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