MON-3701: remove trusted CA bundle from Thanos Querier

[simonpasquier]

The trusted CA bundle was only used by the OAuth proxy container to verify the OAuth server certificate. OAuth proxy is now removed and replaced by kube-rbac-proxy hence there's no need to keep the trusted CA configmap around.

• [ ] I added CHANGELOG entry for this change.
• [x] No user facing changes, so no entry in CHANGELOG was needed.

[openshift-ci-robot]

@simonpasquier: This pull request references MON-3071 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.16.0" version, but no target version was set.

In response to [this](https://github.com/openshift/cluster-monitoring-operator/pull/2325): >The trusted CA bundle was only used by the OAuth proxy container to verify the OAuth server certificate. OAuth proxy is now removed and replaced by kube-rbac-proxy hence there's no need to keep the trusted CA configmap around. > > > >* [ ] I added CHANGELOG entry for this change. >* [ ] No user facing changes, so no entry in CHANGELOG was needed. > Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fcluster-monitoring-operator). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[openshift-ci-robot]

@simonpasquier: This pull request references MON-3701 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.16.0" version, but no target version was set.

In response to [this](https://github.com/openshift/cluster-monitoring-operator/pull/2325): >The trusted CA bundle was only used by the OAuth proxy container to verify the OAuth server certificate. OAuth proxy is now removed and replaced by kube-rbac-proxy hence there's no need to keep the trusted CA configmap around. > > > >* [ ] I added CHANGELOG entry for this change. >* [x] No user facing changes, so no entry in CHANGELOG was needed. > Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fcluster-monitoring-operator). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[rexagod]

/lgtm

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rexagod, simonpasquier

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD f7ab64d78c8f467de3025346dfe7c07637215892 and 2 for PR HEAD f0dea72dd9e387f0239410a3d17a5fb2ca4a6507 in total

[openshift-ci[bot]]

@simonpasquier: all tests passed!

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[openshift-bot]

[ART PR BUILD NOTIFIER]

This PR has been included in build cluster-monitoring-operator-container-v4.16.0-202404181209.p0.g65ee646.assembly.stream.el9 for distgit cluster-monitoring-operator. All builds following this will include this PR.