TrigEgammaHypo: delete unused legacy configuration

Delete unused legacy config and some minor cleanup of imports.

This merge request affects 1 package:

• Trigger/TrigHypothesis/TrigEgammaHypo

This merge request affects 2 files:

• Trigger/TrigHypothesis/TrigEgammaHypo/python/TrigEgammaFastCaloHypoTool.py
• Trigger/TrigHypothesis/TrigEgammaHypo/python/TrigEgammaFastElectronHypoTool.py

Adding @mverissi ,@efurtado ,@dbakshig ,@jodafons ,@jlieberm ,@fernando ,@eegidiop as watchers

added Egamma Trigger main review-pending-level-1 labels

CI Result SUCCESS (hash ccb3505e)

	Athena
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 3925]

The changes are straightforward and there are no issues with the CI. Approving from L1.

added review-approved label and removed review-pending-level-1 label

mentioned in commit 89d94849

merged