Organize integrators/ content into subfolders (CL 5).

The CL created subfolder in integrators/ for the following components:
- identity_credential

The cl was creating using the following steps:
1) git mv integrators/file integrators/subfolder/file
2) ./tools/git/mass-rename.py
3) git cl format

Bug: 376223525
Change-Id: I8ba771d8e60574ef707adef8f65bd01d2e83273d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6487328
Reviewed-by: Maria Kazinova <kazinova@google.com>
Reviewed-by: Christoph Schwering <schwering@google.com>
Commit-Queue: Norge Vizcay <vizcay@google.com>
Cr-Commit-Position: refs/heads/main@{#1451107}