Upgrade to TinyMCE7

[jardakotesovec]

For next LTS we aim to have major dependencies all up to date. TinyMCE has not been updated while vue3 upgrade.

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Merge requests:
ui-library: pkp/ui-library#477
pkp-lib: #10773
ojs: pkp/ojs#4578
omp: pkp/omp#1809
ops: pkp/ops#845

Notes:
We upgraded TinyMCE from v5.10.9 to v7.6.0
https://www.tiny.cloud/docs/tinymce/6/migration-from-5x/
https://www.tiny.cloud/docs/tinymce/latest/migration-from-6x/

• Majority of the changes are removing "paste" and "noneditable" plugins as these are now Core part of TinyMCE v6+.
• Some additional settings are also handled differently since editorManager.settings was removed in v6. Workaround is to expose this settings by using $.pkp.controllers.SiteHandler.prototype.tinymceParams_ and set additional settings here.
• The forced_root_block: '' was also deprecated and removed in v6, we use this empty string value in our component FieldRichText. This means that by default for this component, we don't want to set any wrappers to our editor but with v6, TinyMCE sets a <p> wrapper automatically. We remove this wrapper using the "PostProcess" event which is called before returning the .getContent() API from TinyMCE. See forced_root_block deprecation tinymce/tinymce#7342 (comment) for more info. For the other component, FieldRichTextarea, we originally don't set anything for the forced_root_block. This means that by default, the editor will use the default wrapper <p>, which is fine since this has been the default value even for lower version of TInyMCE.

[asmecher]

Once this gets merged, we can also close #9239.