[release/0.9] Update CI (#1891)

* [release/0.9] Update CI

Incorporate several CI changes from multiple PRs:

 - #1632
 - #1752
 - #1755
 - #1799
 - #1820
 - #1836
 - #1853
 - #1854

It is easier to checkout the changes directly rather than cherry-pick
commits and undo any changes that affect code not backported to this
release.

Remove `/usr/local/include` from `Protobuild.toml`, since it does not
exist on Windows, and our CI build logic does not rely on it.

Update `.gitignore` and `.gitattributes` to match main.

Signed-off-by: Hamza El-Saawy <hamzaelsaawy@microsoft.com>

* [release/0.9] Skip failaing symlink tests

CRI integration tests `TestContainerSymlinkVolumes/*` are consistently
failing.

Skip until a fix is backported from containerd 1.7 to 1.6.

Signed-off-by: Hamza El-Saawy <hamzaelsaawy@microsoft.com>

[release/0.9] Skip failing symlink tests

Signed-off-by: Hamza El-Saawy <hamzaelsaawy@microsoft.com>

* [release/0.9] Update proto files to v3

Many files were last updated with `github.com/gogo/protobuf@v1.2`, hence
the `proto.GoGoProtoPackageIsVersion2` assertion in the `*.pb.go` files.

Regenerate them using new version (v1.6.2) of `protoc-gen-gogoctrd`.

Signed-off-by: Hamza El-Saawy <hamzaelsaawy@microsoft.com>

* [release/0.9] Update generated files

Run `go generate` on repo to bring all auto-generated files up to date.

Fix bug in `internal\winapi\winapi.go` where `user.go` is referenced but
does not exist.

Signed-off-by: Hamza El-Saawy <hamzaelsaawy@microsoft.com>

---------

Signed-off-by: Hamza El-Saawy <hamzaelsaawy@microsoft.com>

.gitattributes

@@ -1 +1,3 @@
-* text=auto eol=lf
+* text=auto eol=lf
+vendor/** -text
+test/vendor/** -text