Add reset-current-schedule input to mt-sync-code-data workflow

[Copilot]

Adds optional workflow input to reset the current app schedule before parsing. This enables periodic cleanup of the entire schedule by deleting all files from app-android/src/main/res-*/ directories.

Changes

• Added reset-current-schedule boolean input (default: false) to workflow_dispatch trigger
• New step before "MT parse current" removes all files in app-android/src/main/res-*/ directories when enabled
• Uses simple rm -r command for direct deletion (directories recreated in subsequent CI steps)

Usage

gh workflow run mt-sync-code-data.yml -f reset-current-schedule=true

The deletion step only runs for agency repos (excludes main repo and bike repos) and provides clear logging of the operation. This allows resetting the entire current app schedule to clean up old unused GTFS schedule IDs when needed.

Original prompt

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This section details on the original issue you should resolve

<issue_title>mt-sync-code-data.yml should offer an option to delete current IDs before starting to parse</issue_title>
<issue_description>Changes shared-overwrite/.github/workflows/mt-sync-code-data.yml

Should add workflow_dispatch inputs to delete all current IDs before MT parse current step in order to delete those files:

• app-android/src/main/res-*/raw/*_gtfs_schedule_path_ids
• app-android/src/main/res-*/raw/*_gtfs_schedule_service_ids
• app-android/src/main/res-*/raw/*_gtfs_strings
  In order to forget about old unused IDs.
  This will cause data change that we generally want to avoid but it's necessary to clean sometimes.

Actuall should just delete entire schedule (all files) from app-android/src/main/res-*/.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes mt-sync-code-data.yml should offer an option to delete current IDs before starting to parse #540

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