Support Azure DevOps vs-ssh.visualstudio.com SSH remotes as hosting provider (#4822)

**PR Description**  
This PR adds support for parsing **legacy Azure DevOps SSH remotes**
that use the
`vs-ssh.visualstudio.com` host, which is still common in older
repositories or corporate setups.

This PR fixes issue #2667.

Previously, even if users mapped this host to the Azure DevOps provider
via
`configServiceDomains`, URL generation failed with:
```
Failed to parse repo information from url
```
because the Azure DevOps `ServiceDefinition` regex set did not include
this SSH format.

### Changes
- Added a new regex to `azdoServiceDef.regexStrings` to match:
  ```
  git@vs-ssh.visualstudio.com:v3/<org>/<project>/<repo>
  ```
- This allows `getRepoURLFromRemoteURL` to correctly extract `org`,
`project`, and `repo`
  for these remotes.
- Added a test case to `TestGetPullRequestURL` verifying that mapping  
`vs-ssh.visualstudio.com` → `azuredevops:dev.azure.com` produces the
correct PR URL.

### Example
With this config:
```yaml
services:
  'vs-ssh.visualstudio.com': 'azuredevops:dev.azure.com'
```
and remote:
```
git@vs-ssh.visualstudio.com:v3/myorg/myproject/myrepo
```
`GetPullRequestURL("feature/new", "")` now returns:
```
https://dev.azure.com/myorg/myproject/_git/myrepo/pullrequestcreate?sourceRef=feature%2Fnew
```

### Why
- Many users still have remotes in this legacy format.
- This change is **backward-compatible** and does not affect existing
supported remotes.
- It unblocks URL generation for PRs and commits without requiring users
to change their remotes.
- Fixes #2667

pkg/commands/hosting_service/definitions.go

@@ -46,6 +46,7 @@ var azdoServiceDef = ServiceDefinition{
 	pullRequestURLIntoTargetBranch:  "/pullrequestcreate?sourceRef={{.From}}&targetRef={{.To}}",
 	commitURL:                       "/commit/{{.CommitHash}}",
 	regexStrings: []string{
+		`^.+@vs-ssh\.visualstudio\.com[:/](?:v3/)?(?P<org>[^/]+)/(?P<project>[^/]+)/(?P<repo>[^/]+?)(?:\.git)?$`,
 		`^git@ssh.dev.azure.com.*/(?P<org>.*)/(?P<project>.*)/(?P<repo>.*?)(?:\.git)?$`,
 		`^https://.*@dev.azure.com/(?P<org>.*?)/(?P<project>.*?)/_git/(?P<repo>.*?)(?:\.git)?$`,
 		`^https://.*/(?P<org>.*?)/(?P<project>.*?)/_git/(?P<repo>.*?)(?:\.git)?$`,

pkg/commands/hosting_service/hosting_service_test.go

@@ -223,6 +223,18 @@ func TestGetPullRequestURL(t *testing.T) {
 				assert.Equal(t, "https://mycompany.azuredevops.com/collection/myproject/_git/myrepo/pullrequestcreate?sourceRef=feature%2Fnew", url)
 			},
 		},
+		{
+			testName:  "Opens a link to new pull request on Azure DevOps (legacy vs-ssh.visualstudio.com SSH) with mapping to dev.azure.com",
+			from:      "feature/new",
+			remoteUrl: "git@vs-ssh.visualstudio.com:v3/myorg/myproject/myrepo",
+			configServiceDomains: map[string]string{
+				"vs-ssh.visualstudio.com": "azuredevops:dev.azure.com",
+			},
+			test: func(url string, err error) {
+				assert.NoError(t, err)
+				assert.Equal(t, "https://dev.azure.com/myorg/myproject/_git/myrepo/pullrequestcreate?sourceRef=feature%2Fnew", url)
+			},
+		},
 		{
 			testName:  "Opens a link to new pull request on Bitbucket Server (SSH)",
 			from:      "feature/new",