feat: small improvements on the aggsender

[goran-ethernal]

Description

This PR introduces couple of improvements to the aggsender:

1. Remove unnecessary SaveCertificatesToFilesPath config parameter, which was used to save certificates we send to the agglayer to some temporary file. Since we are already saving the entire json format to the aggsender db, this became redundant.
2. Expanded the aggsender.md with new configuration parameters that were added in couple of previous PRs.
3. Removed the check for pending certificates in the sendCertificate function, since we are already checking this before we make a call to that function.
4. In the aggchain prover flow, when we are resending the certificate that is InError, we will always make a call to the aggchain prover to get the proof, even though we might have it, because, the previously sent InError certificate might be subject to a reorg, and the previous sent proof might not be valid anymore.
5. Renamed the AggchainProverMode to the AggchainProofMode to be more consistent.

Fixes # (issue)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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