fix(helm): should not set webhook caBundle when cert-manager enabled

[erikgb]

What problem does this PR solve?

We use FluxCD to install chaos-mesh, and prefer to use cert-manager for all PKI-related in our clusters. When enabling cert-manager in chaos-mesh Helm chart, the templates for the validating and mutating webhook set a dummy value for the webhook caBundle field. This is not correct IMO, and causes Flux and cert-manager to "fight" about managing the field - since both are reconciling the resources periodically.

What's changed and how it works?

This PR removes the dummy value set for webhook caBundle field when cert-manager enabled, which will allow cert-manager (ca-injector) to fully manage this particular field in the resources.

Related changes

• This change also requires further updates to the website (e.g. docs)
• This change also requires further updates to the UI interface

Cherry-pick to release branches (optional)

This PR should be cherry-picked to the following release branches:

• release-2.6
• release-2.5

Checklist

CHANGELOG

Must include at least one of them.

• I have updated the CHANGELOG.md
• I have labeled this PR with "no-need-update-changelog"

Tests

Must include at least one of them.

• Unit test
• E2E test
• Manual test

Side effects

• Breaking backward compatibility

DCO

If you find the DCO check fails, please run commands like below (Depends on the actual situations. For example, if the failed commit isn't the most recent) to fix it:

git commit --amend --signoff
git push --force

[Gallardot]

@erikgb Thank you for your contribution. LGTM, but please make the CI happy.

[erikgb]

Thanks @Gallardot! The failing integration test seems to be unrelated (a timeout). For the changelog check: do you think this change requires a changelog entry or not?