Extensions Enhancements and Items to consider for 2.12

[nwmac]

1. Vue 3 Migration support for extension developers Vue 3 Migration support for extension developers #11476
2. Vue 3 Migration of our own extensions [Epic] Vue 3 Migration of our own extensions #11477
3. Vue 3 extension validation and compatibility Extensions: Vue 3 extension validation and compatibility #11482
4. Allow Login component/page to be changed Extensions: Allow Login component/page to be changed #11480
5. Support branding in extensions Support branding in extensions #11481
6. Provide tooling for inclusion of a custom icon font for an extension Provide tooling for inclusion of a custom icon font for an extension #11478
7. Provide tooling for inclusion custom styles (perhaps not documented initially, as we want to validate use cases) Provide tooling for inclusion custom styles #11479
8. Model extensions – via interfaces
9. Hooks for fetching on table changes - e.g. when a table is displayed, an extension can fetch data that is needed for the rows and it can know when the page changes etc so that it can go and fetch more data Extensions: Hooks for fetching on table changes #11483
10. Convert the various creators into a single creator Extensions: Convert the various creators into a single creator #11484
11. Changes for Virtual Clusters
12. Removing hard-coded Harvester and Elemental code from dashboard Extensions: Removing hard-coded Harvester and Elemental code from dashboard #11485
13. Factor out more code into built-in extensions (start with Fleet: Move Fleet code into a built-in extension #11417. Other areas to be accounted for could be the "top-level-products" like Cluster Management, Users & auth, Global Settings, Extensions, Cluster explorer)
14. Improve extensions API