* Remove activity (#29056)

* remove activity frontend

* remove the activity page code

* remove GET api/activity/ route + tests

* regen dox for activity routes

- Not for GET /api/activity/ which has been removed.

* nix more things only used for GET /api/activity/

* pull out more only-used-for-get-api/activity/ code

* force namespace to be loaded (?) to be found

---------

Co-authored-by: Aleksandr Lesnenko <alxnddr@gmail.com>
Co-authored-by: Bryan Maass <bryan.maass@gmail.com>
Co-authored-by: Aleksandr Lesnenko <alxnddr@users.noreply.github.com>

* fix ns requires in api/activity + test

* remove most-recently-viewed-dashboard-views-test

* linter fix

---------

Co-authored-by: Kyle Doherty <5248953+kdoh@users.noreply.github.com>
Co-authored-by: Bryan Maass <bryan.maass@gmail.com>

* update description

* update api docs with script

* fix automatic dox generation for malli+defendpoint

- there isn't a concept of not having an error message for a schema \o/
- warn but don't break when the schema is invalid
- polish the descriptions a little "a nullable a vector" -> "a nullable vector"

* gitignore malli types files

* schema -> defendpoint api/setting GET :key

+ docs example

* schema -> defendpoint api/action + dox generation

* quickfix + add smaller trivial tests

* add imported clj kondo rules to git

* add with-api-error-message to fix some tests

* use mu/with-api-error-message

* fix tests

* finish defendpoint migration for api/action ns

* do not stringify errors

* fix devtime annoyance with malli-dox generation

* more polish

- add length to numerics
- respond to review

* unused var linter fix

* fix off by 1 in umd/description

* aligator eats the big number + update action.md

* remove toc generation from api docs

* update api docs

* update test

* Rename DashboardCard `sizeX` and `sizeY` to `size_x` and `size_y` (#16344)

* Fix migration

* Fix MySQL/MariaDB

* Revert "Revert new precondition"

This reverts commit 1f97a4d6ccfdaa92ff82fd0256f08f3512c3c5e7.

* Revert "plug in and alter tests to use with-actions-test-data"

This reverts commit 2f33cb47b700b1da106adf54d41928c5956978d0.

* Revert "Add Database-local Setting for enabling Actions for a specific Database"

This reverts commit a52f8d0a478a31bb1f1b4a6693abf8f8e658d9cf.

* Revert "Make sure api.actions is loaded"

This reverts commit 7d7b913a7a0d64cbe2b6907f389d994a1130c0f5.

* Revert "Add `experimental-enable-actions` feature flag (#22559)"

This reverts commit 9b313752.

* Revert "SQL JDBC Delete Row Action (#22608)"

This reverts commit d6864f38.

* Remove actions api docs

* Revert "Destructible version of `test-data` dataset for testing writeback actions (#22692)"

This reverts commit 15c57d9a.

* keep around a few misc improvements

* removes precondition

- {:pre [(nil? (namespace symb))]}

* various fixes that needn't be reverted