Go 1.17 and later use modern `//go:build` constraints, the old `// +build:` constraints should be removed.

* OpenRepositoryCtx -> OpenRepository
* OpenRepository -> openRepositoryWithDefaultContext, only for internal usage

This PR continues the work in #17125 by progressively ensuring that git
commands run within the request context.

This now means that the if there is a git repo already open in the context it will be used instead of reopening it.
Signed-off-by: Andrew Thornton <art27@cantab.net>

Make Requests Processes and create process hierarchy. Associate OpenRepository with context. (#17125)

This PR registers requests with the process manager and manages hierarchy within the processes.

Git repos are then associated with a context, (usually the request's context) - with sub commands using this context as their base context.
Signed-off-by: Andrew Thornton <art27@cantab.net>

* Add bundle download
Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Fix fmt
Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Fix build tags
Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Download specific commit
Signed-off-by: jolheiser <john.olheiser@gmail.com>

Following the merging of https://github.com/go-git/go-git/pull/330

 we
can now add a setting to avoid go-git reading and caching large objects.
Signed-off-by: Andrew Thornton <art27@cantab.net>

* Move last commit cache back into modules/git
Signed-off-by: Andrew Thornton <art27@cantab.net>

* Remove go-git from the interface for last commit cache
Signed-off-by: Andrew Thornton <art27@cantab.net>

* move cacheref to last_commit_cache
Signed-off-by: Andrew Thornton <art27@cantab.net>

* Remove go-git from routers/private/hook
Signed-off-by: Andrew Thornton <art27@cantab.net>

* Move FindLFSFiles to pipeline
Signed-off-by: Andrew Thornton <art27@cantab.net>

* Make no-go-git variants
Signed-off-by: Andrew Thornton <art27@cantab.net>

* Submodule RefID
Signed-off-by: Andrew Thornton <art27@cantab.net>

* fix issue with GetCommitsInfo
Signed-off-by: Andrew Thornton <art27@cantab.net>

* fix GetLastCommitForPaths
Signed-off-by: Andrew Thornton <art27@cantab.net>

* Improve efficiency
Signed-off-by: Andrew Thornton <art27@cantab.net>

* More efficiency
Signed-off-by: Andrew Thornton <art27@cantab.net>

* even faster
Signed-off-by: Andrew Thornton <art27@cantab.net>

* Reduce duplication

* As per @lunny
Signed-off-by: Andrew Thornton <art27@cantab.net>

* attempt to fix drone
Signed-off-by: Andrew Thornton <art27@cantab.net>

* fix test-tags
Signed-off-by: Andrew Thornton <art27@cantab.net>

* default to use no-go-git variants and add gogit build tag
Signed-off-by: Andrew Thornton <art27@cantab.net>

* placate lint
Signed-off-by: Andrew Thornton <art27@cantab.net>

* as per @6543
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>