jake/gh 20356 (#20485)

* [MM-44667] Set InsecureSkipVerify for S3 when EnableInsecureOutgoingConnections is set

* Cleanup s3New, customTransport

* Lint fixes

* Cleanup s3store_test.go

* Using default transport

```release-note
NONE
```

Co-authored-by: Jake Gutierrez <jakegut0108@gmail.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/users/profile_picture.go

@@ -57,7 +57,8 @@ func (us *UserService) GetProfileImage(user *model.User) ([]byte, bool, error) {
 
 func (us *UserService) FileBackend() (filestore.FileBackend, error) {
 	license := us.license()
-	backend, err := filestore.NewFileBackend(us.config().FileSettings.ToFileBackendSettings(license != nil && *license.Features.Compliance))
+	insecure := us.config().ServiceSettings.EnableInsecureOutgoingConnections
+	backend, err := filestore.NewFileBackend(us.config().FileSettings.ToFileBackendSettings(license != nil && *license.Features.Compliance, insecure != nil && *insecure))
 	if err != nil {
 		return nil, err
 	}