feat: Handle how GridSite Trust Fingerprint Uses non-Colon-Separated Hex

[mvazquezc]

Problem:
The GridSite.spec.trust.certFingerprint field expects colon-separated hex (ab:cd:ef:...), not plain hex (abcdef...). The operator computes the fingerprint as:

digest.iter().map(|b| format!("{b:02x}")).collect::<Vec<_>>().join(":")

The fingerprint is a SHA-256 hash of the trimmed PEM string bytes (not DER). Using openssl x509 -fingerprint or sha256sum without
colon formatting produces a mismatch, and the site stays in Connecting with TrustPolicyMismatch.

Workaround: Compute fingerprints using the PEM from publicCertPem in the GridSite status, with colon-separated output:

CERT_PEM=$(oc get gridsite <name> -o jsonpath='{.status.publicCertPem}')
echo -n "$CERT_PEM" | sed 's/^[[:space:]]*//;s/[[:space:]]*$//' |  sha256sum | awk '{print $1}' | sed 's/\(..\)/\1:/g;s/:$//'

Proposed fix:
Document the fingerprint format in the CRD description. Consider also accepting plain hex (without colons) and normalizing internally.