AB#496 Enable transit group relax function in planconnection query

[hjvuor]

Proposed Changes

• Adds a default relaxation of 5 minutes and 1.2 times the original time
• The arguments are always included in the query but have no effect unless transit groups are defined on the backend side

Pull Request Check List

• A reasonable set of unit tests is included
• Console does not show new warnings/errors
• Changes are documented or they are self explanatory
• This pull request does not have any merge conflicts
• All existing tests pass in CI build

Review

• Read and verify the code changes
• Test the functionality by running the UI locally with all popular browsers available in your platform
• Check that the implementation matches the design, when such one is defined in an issue in Azure Boards
• Merge the pull request