[OCPP 1.6] InvalidCentralSystemCertificate being logged too frequently

[james-ctc]

Describe your changes

fix: InvalidCentralSystemCertificate was logged on every failed connection

A CSMS certificate may be considered invalid when a charger has the incorrect time. This can be recovered by using NTP. However a security event is raised for each failed connection attempt until the correct time is set.

This change ensures that InvalidCentralSystemCertificate is logged only on the first occurance.

Issue ticket number and link

Checklist before requesting a review

• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• If OCPP 2.0.1 or OCPP2.1: I have updated the OCPP 2.x status document
• I read the contribution documentation and made sure that my changes meet its requirements

[felix-ulonska]

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