[8.x](backport #5494) Add support for CLI flag for mTLS client certificate key passphrase #5574
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What does this PR do?
It adds support for encrypted client certificate key during install/enroll, which done by the cli flag
--elastic-agent-cert-key-passphrase.Why is it important?
It enables Elastic Agent to be configured with passphrase-protected private keys for client mTLS certificates.
Checklist
[ ] I have made corresponding change to the default configuration files./changelog/fragmentsusing the changelog tool[ ] I have added an integration test or an E2E testAuthor's checklist
Tests
--elastic-agent-cert-key-passphraseadheres to the same requirements as--fleet-server-cert-key-passphrase.--elastic-agent-cert-keyand--elastic-agent-certare provided when--elastic-agent-cert-key-passphraseis present.*enrollCmdOption.remoteConfig()accurately incorporates the passphrase intotlscommon.CertificateConfig.fleetclient.NewWithConfiggenerates a valid client capable of establishing an mTLS connection to a mock server.policy with SSL configto ensure the client certificate key passphrase from the cli is not left in the config when the policy's client client certificate key is not passphrase-protected.Disruptive User Impact
How to test this PR locally
Related issues
Questions to ask yourself
This is an automatic backport of pull request #5494 done by [Mergify](https://mergify.com).