v1.17: geyser: allow custom name in config file (backport of #33550)

[mergify]

This is an automatic backport of pull request #33550 done by Mergify.
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	both modified:   geyser-plugin-manager/src/geyser_plugin_manager.rs

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[willhickey]

We can't backport this to beta at this point in the stabilization cycle...

The master version of this has run on canaries but not on a whole cluster. Since beta will be promoted to stable soon, backporting this to beta will ship it to mainnet-beta very quickly with minimal time to test on testnet.

[fanatid]

branch with fix: https://github.com/fanatid/solana/tree/pr-33550

[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (407dfba) 81.6% compared to head (bccfc96) 81.7%.
Report is 2 commits behind head on v1.17.

Additional details and impacted files

@@           Coverage Diff           @@
##            v1.17   #34669   +/-   ##
=======================================
  Coverage    81.6%    81.7%           
=======================================
  Files         805      805           
  Lines      218806   218825   +19     
=======================================
+ Hits       178747   178801   +54     
+ Misses      40059    40024   -35     

[lijunwangs]

This change is very low risk -- only loading the plugin name from the config file if set, otherwise the logic should behaves as before. Okay to backport.