Fast run change for HLT1

Update the online components of HLT1 to configure and allow fast run changes of TCKs.

Add three tests that test a fast run change of TCK:

• Create a new TCK from an existing one that changes a single prescale
• Run HLT1 on some modified MEPs to trigger a run change and an update of the TCK
• Check that the output of the previous tests is consistent with expectations: the output data of the second run in the test shows no events selected by the line that was prescaled and the HltDecReports contain the new TCK

Depends on Allen!1659 (merged), Moore!3521 (merged) and lhcb-datapkg/PRConfig!425 (merged)