Switch OCA references of credential_support_url to issuer_url

[knguyenBC]

Background

When a proof request is received and the user does not have the credential, the wallet uses credential_support_url from OCA as the hyperlink for the "Get this credential" button. This is counter intuitive as that credential_support_url is meant to be the hyperlink to the support url (i.e. the contact us page or email) for the credential. It is meant to be accompanied by the credential_help_text (and it's text display). This is defined in the credential design guide: https://bcgov.github.io/digital-trust-toolkit/docs/resources/guides/credential-ux-guide#credential-meta-information

This is causing some confusion with people building their own OCA bundle.

Acceptance Criteria

Switch the reference from credential_support_url to issuer_url

[knguyenBC]

LCRB seem to have built their OCA to match how BC Wallet is currently referencing credential_support_url. i.e. their meta overlay links to the issuance page. Whereas the student card OCA is built to match the credential design guide.