Plugins: Refactor plugin download/installation (#43046)

* installer -> repo

* add semver format checking

* add plugin callbacks in test

* remove newline

* post install only scans new directories

* remove unused stuff

* everything in own package

* add missing cli params

* make grafana version part of the API

* resolve conflicts

* tidy up logger

* fix cli and tidy log statements

* rename log package

* update struct name

* fix linter issue

* fs -> filestore

* reorder imports

* alias import

* fix test

* fix test

* inline var

* revert jsonc file

* make repo dep of manager

* actually inject the thing

* accept all args for compatability checks

* accept compat from store

* pass os + arch vals

* don't inject fs

* tidy up

* tidy up

* merge with main and tidy fs storage

* fix test

* fix packages

* fix comment + field name

* update fs naming

* fixed wire

* remove unused func

* fix mocks

* fix storage test

* renaming

* fix log line

* fix test

* re-order field

* tidying

* add test for update with same version

* fix wire for CLI

* remove use of ioutil

* don't pass field

* small tidy

* ignore code scanning warn

* fix testdata link

* update lgtm code

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