log: send a event when secret is not found

[jiuker]

Description

log: send a event when secret is not found
if secret is not found, getting the operator log is the only way before.

Now we send a event to K8S as well

Related Issue

Type of Change

• Bug fix 🐛
• New feature 🚀
• Breaking change 🚨
• Documentation update 📖
• Refactor 🔨
• Other (please describe) ⬇️

log

Screenshots (if applicable e.g before/after)

Checklist

• I have tested these changes
• I have updated relevant documentation (if applicable)
• I have added necessary unit tests (if applicable)

Test Steps

1. Deploy a tenant without secret
2. We can get the warnning by kubectl get events -n namespace

Additional Notes / Context

[cesnietor]

@jiuker please fill the PR template appropiately.
cc @ramondeklein @shtripat