change input type of leg_group_id

[josh-willis-arcadis]

Checklist

• Appropriate branch selected (all PRs must first be merged to dev before they can be merged to master)
• Any modified or new methods or classes have helpful JSDoc and code is thoroughly commented
• The description lists all applicable issues this PR seeks to resolve
• The description lists any configuration setting(s) that differ from the default settings
• All tests and CI builds passing
• The description lists all relevant PRs included in this release (remove this if not merging to master)
• e2e tests are all passing (remove this if not merging to master)

Description

Change the inputType of leg_group_id from GTFS_ID to TEXT. A TODO has been added to address the reference to fare_transfer_rule.

[miles-grant-ibigroup]

Yeah and it doesn't have to be unique right