Rename nimbus binary to nimbus_execution_client

[pedromiguelmiranda]

Renaming nimbus binary to nimbus_execution_client in order to free the "nimbus" binary name. addresses issue #2258

Directory renaming will be addressed in a different issue (#2738)

[advaita-saha]

Kurtosis check is breaking, as it keeps waiting for the CL to sync
Issue happened after ethpandaops/ethereum-package#804

I am working with the ethpandaops to fix this, till then not to worry about the kurtosis check

[pedromiguelmiranda]

This pr only addresses the binary name as identified in #2258.

We could go further and rename the source directory from nimbus to nimbus_execution_client , however all files history under nimbus directory won't be easily accessible via git log command, only via git log --follow.

Would like to get some opinions regarding if we are confortable with the directory renaming, or I can open a follow up issue to think/discuss about it about it

[kdeme]

Fluffy failure is a flaky test due to a recent change. Can be ignored here.

[tersec]

This pr only addresses the binary name as identified in #2258.

We could go further and rename the source directory from nimbus to nimbus_execution_client , however all files history under nimbus directory won't be easily accessible via git log command, only via git log --follow.

Would like to get some opinions regarding if we are confortable with the directory renaming, or I can open a follow up issue to think/discuss about it about it

Seems fine to leave the directory as-is for now. Can be discussed in a separate issue or PR.