Implement role check for mailables

[taslangraham]

As part of the work that needs to be done for #10403, we need to implement role checks for mailables and email templates:

• Role Designation for Email Templates: Enable editors to assign specific user groups when creating or editing an email template. This feature should be restricted to mailables associated with the submission workflow.

  • This will require UI work on the Edit/Add Template side modal to support selecting user groups. Maybe something like a list of checkboxes or a multi-select dropdown might be enough. @Devika008 Tagging here for your input

• Role Designation for mailables Allow mailables to be assigned to specific roles, ensuring that templates are accessible only to users with relevant roles.

• Template-Specific Restrictions: Users should only access templates explicitly assigned to their group within each mailable. For example, if a mailable is accessible to both editors and authors, but a specific template is restricted to editors, then only editors should see that template, and authors should not have access.

PRs
ojs - pkp/ojs#4510
pkp-lib - https://github.com/pkp/pkp-lib/pull/10581/files
ui-library - pkp/ui-library#446

omp - pkp/omp#1768
ops - https://github.com/pkp/ops/pull/815/files

PRs were closed and changes merged into temporary branches on my forks until we have a branch for 3.6 code. Once we have a branch for 3.6 these changes can be merged in.

Branches:
pkp-lib - https://github.com/taslangraham/pkp-lib/tree/feature-i10403-email-access-restrictions
ui-library - https://github.com/taslangraham/ui-library/tree/feature/i10403-email-access-restrictions
ojs - https://github.com/taslangraham/ojs/tree/feature/i10403-email-access-restrictions
omp - https://github.com/taslangraham/omp/tree/feature/i10403-email-access-restrictions
ops - https://github.com/taslangraham/ops/tree/feature/i10403-email-access-restrictions