Add pre/post signals for write-lumi and write-run

[makortel]

In the context of #28521 @Dr15Jones and I realized that while the framework emits pre/post signals for globalEndLumi before/after the global end-lumi functions of all modules (including output) have been called, there are no signals for the subsequent write-lumi transitions (same holds for run).

We came to the conclusion that it would be beneficial to add pre/post signals for write-lumi and write-run in order to let other parts know when the processing of lumis and runs are fully done.

[cmsbuild]

A new Issue was created by @makortel Matti Kortelainen.

@davidlange6, @Dr15Jones, @smuzaffar, @fabiocos, @kpedro88 can you please review it and eventually sign/assign? Thanks.

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[Dr15Jones]

assign core

[cmsbuild]

New categories assigned: core

@Dr15Jones,@smuzaffar you have been requested to review this Pull request/Issue and eventually sign? Thanks

[schneiml]

Just to confirm: this is exactly what I wanted to request in #28521.

[Dr15Jones]

Accomplished with #28562

[Dr15Jones]

+1

[cmsbuild]

This issue is fully signed and ready to be closed.