fix(librarian): temporarily use short SHA for release links (#2325)

We noticed that we were not able to open the release init PR today
because the character limit exceeds what github allows. For now, by
shortening the SHA links we can get under this limit. We should have a
more robust solution in the future.

Related-disscussion: https://github.com/orgs/community/discussions/27190
Related: #2234
Fixes: #2321

Author: codyoss

internal/librarian/release_notes.go

@@ -76,9 +76,9 @@ Language Image: {{.ImageVersion}}
 ### {{.Heading}}
 {{ range .Commits }}
 {{ if index .Footers "PiperOrigin-RevId" -}}
-* {{.Subject}} {{.Body}} (PiperOrigin-RevId: {{index .Footers "PiperOrigin-RevId"}}) ([{{shortSHA .CommitHash}}]({{"https://github.com/"}}{{$noteSection.RepoOwner}}/{{$noteSection.RepoName}}/commit/{{.CommitHash}}))
+* {{.Subject}} {{.Body}} (PiperOrigin-RevId: {{index .Footers "PiperOrigin-RevId"}}) ([{{shortSHA .CommitHash}}]({{"https://github.com/"}}{{$noteSection.RepoOwner}}/{{$noteSection.RepoName}}/commit/{{shortSHA .CommitHash}}))
 {{- else -}}
-* {{.Subject}} {{.Body}} ([{{shortSHA .CommitHash}}]({{"https://github.com/"}}{{$noteSection.RepoOwner}}/{{$noteSection.RepoName}}/commit/{{.CommitHash}}))
+* {{.Subject}} {{.Body}} ([{{shortSHA .CommitHash}}]({{"https://github.com/"}}{{$noteSection.RepoOwner}}/{{$noteSection.RepoName}}/commit/{{shortSHA .CommitHash}}))
 {{- end }}
 {{ end }}
 

internal/librarian/release_notes_test.go

@@ -529,11 +529,11 @@ Language Image: go:1.21
 
 ### Features
 
-* new feature  ([1234567](https://github.com/owner/repo/commit/1234567890abcdef000000000000000000000000))
+* new feature  ([1234567](https://github.com/owner/repo/commit/1234567))
 
 ### Bug Fixes
 
-* a bug fix  ([fedcba0](https://github.com/owner/repo/commit/fedcba0987654321000000000000000000000000))
+* a bug fix  ([fedcba0](https://github.com/owner/repo/commit/fedcba0))
 
 </details>`,
 				librarianVersion, today),
@@ -579,11 +579,11 @@ Language Image: go:1.21
 
 ### Features
 
-* new feature  (PiperOrigin-RevId: 123456) ([1234567](https://github.com/owner/repo/commit/1234567890abcdef000000000000000000000000))
+* new feature  (PiperOrigin-RevId: 123456) ([1234567](https://github.com/owner/repo/commit/1234567))
 
 ### Bug Fixes
 
-* a bug fix  (PiperOrigin-RevId: 987654) ([fedcba0](https://github.com/owner/repo/commit/fedcba0987654321000000000000000000000000))
+* a bug fix  (PiperOrigin-RevId: 987654) ([fedcba0](https://github.com/owner/repo/commit/fedcba0))
 
 </details>`,
 				librarianVersion, today),
@@ -623,9 +623,9 @@ Language Image: go:1.21
 
 ### Features
 
-* new feature  ([1234567](https://github.com/owner/repo/commit/1234567890abcdef000000000000000000000000))
+* new feature  ([1234567](https://github.com/owner/repo/commit/1234567))
 
-* another new feature  ([fedcba0](https://github.com/owner/repo/commit/fedcba0987654321000000000000000000000000))
+* another new feature  ([fedcba0](https://github.com/owner/repo/commit/fedcba0))
 
 </details>`,
 				librarianVersion, today),
@@ -674,7 +674,7 @@ Language Image: go:1.21
 
 ### Features
 
-* feature for a  ([1234567](https://github.com/owner/repo/commit/1234567890abcdef000000000000000000000000))
+* feature for a  ([1234567](https://github.com/owner/repo/commit/1234567))
 
 </details>
 
@@ -685,7 +685,7 @@ Language Image: go:1.21
 
 ### Bug Fixes
 
-* fix for b  ([fedcba0](https://github.com/owner/repo/commit/fedcba0987654321000000000000000000000000))
+* fix for b  ([fedcba0](https://github.com/owner/repo/commit/fedcba0))
 
 </details>`,
 				librarianVersion, today, today),
@@ -725,7 +725,7 @@ Language Image: go:1.21
 
 ### Features
 
-* new feature  ([1234567](https://github.com/owner/repo/commit/1234567890abcdef000000000000000000000000))
+* new feature  ([1234567](https://github.com/owner/repo/commit/1234567))
 
 </details>`,
 				librarianVersion, today),
@@ -761,7 +761,7 @@ Language Image: go:1.21
 
 ### Features
 
-* new feature this is the body ([1234567](https://github.com/owner/repo/commit/1234567890abcdef000000000000000000000000))
+* new feature this is the body ([1234567](https://github.com/owner/repo/commit/1234567))
 
 </details>`,
 				librarianVersion, today),