chore: Add SshConfigConfigurator configurator

[vinokurig]

What does this PR do?

Ensure that the SSH key Secret from the Workspace namespace does not contain the ssh_config key in its data. If the key is present in the Secret data, remove it and create a dedicated git-ssh-config ConfigMap to mount SSH Config.

Screenshot/screencast of this PR

What issues does this PR fix or reference?

https://issues.redhat.com/browse/CRW-8890
eclipse-che/che-dashboard#1443

How to test this PR?

1. Add an SSH key to the user namespace.
2. Apply the related dashboard pull request image: quay.io/eclipse/che-dashboard:pr-1443.
3. Apply the che-server pull request image: quay.io/eclipse/che-server:pr-.
4. Start a workspace.
5. See: workspace starts successfully.

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Release Notes

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[openshift-ci]

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[vinokurig]

/retest

[openshift-ci]

@vinokurig: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v19-github-with-pat-setup-flow	a9b3bb8	link	true	/test v19-github-with-pat-setup-flow
ci/prow/v19-bitbucket-no-pat-oauth-flow-ssh-url	a9b3bb8	link	true	/test v19-bitbucket-no-pat-oauth-flow-ssh-url
ci/prow/v19-azure-with-pat-setup-flow	a9b3bb8	link	true	/test v19-azure-with-pat-setup-flow
ci/prow/v19-gitlab-with-oauth-setup-flow	a9b3bb8	link	true	/test v19-gitlab-with-oauth-setup-flow
ci/prow/v19-gitlab-no-pat-oauth-flow-ssh-url	a9b3bb8	link	true	/test v19-gitlab-no-pat-oauth-flow-ssh-url
ci/prow/v19-gitea-no-pat-oauth-flow	a9b3bb8	link	true	/test v19-gitea-no-pat-oauth-flow
ci/prow/v19-gitlab-with-pat-setup-flow	a9b3bb8	link	true	/test v19-gitlab-with-pat-setup-flow
ci/prow/v19-azure-no-pat-oauth-flow-ssh-url	a9b3bb8	link	true	/test v19-azure-no-pat-oauth-flow-ssh-url
ci/prow/v19-github-no-pat-oauth-flow-ssh-url	a9b3bb8	link	true	/test v19-github-no-pat-oauth-flow-ssh-url

Full PR test history. Your PR dashboard.

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