In this commit, we unit test bootstraptoken agent on tlsbootstrap
functionality by testing `AllowBootstrapTokensToPostCSRs`,
`AutoApproveKarmadaAgentBootstrapTokens`, and `AutoApproveAgentCertificateRotation`
making sure they are working as expected.
Signed-off-by: Mohamed Awnallah <mohamedmohey2352@gmail.com>