Dash/oren/global bgs cassette cleanup (#16288)

* replace hardcoded BGS base URL with cassette placeholder <BGS_BASE_URL> everywhere else

* but then remove newly orphaned claims_api BGS cassettes instead

* update codeowners
- empty bgs/claims cassette dir
- extricate lighthouse-dash from external cassette dirs

* and also remove newly orphaned claims_api non-BGS cassettes

* Revert "and also remove newly orphaned claims_api non-BGS cassettes"

This reverts commit 3e5ac2e44ea87636014a09dc7b74593127f11db7.
cassette orphan unfair characterization

* Revert "but then remove newly orphaned claims_api BGS cassettes instead"

This reverts commit 4f5c9e6.
cassette orphan unfair characterization

.github/CODEOWNERS

@@ -1798,7 +1798,7 @@ spec/support/vcr_cassettes/bgs @department-of-veterans-affairs/benefits-dependen
 spec/support/vcr_cassettes/bgs/claims @department-of-veterans-affairs/Benefits-Team-1 @department-of-veterans-affairs/va-api-engineers @department-of-veterans-affairs/backend-review-group
 spec/support/vcr_cassettes/bgs/benefit_claim @department-of-veterans-affairs/benefits-management-tools-be @department-of-veterans-affairs/va-api-engineers @department-of-veterans-affairs/backend-review-group
 spec/support/vcr_cassettes/bid @department-of-veterans-affairs/Disability-Experience @department-of-veterans-affairs/va-api-engineers @department-of-veterans-affairs/backend-review-group
-spec/support/vcr_cassettes/brd @department-of-veterans-affairs/lighthouse-dash @department-of-veterans-affairs/dbex-trex @department-of-veterans-affairs/Disability-Experience
+spec/support/vcr_cassettes/brd @department-of-veterans-affairs/dbex-trex @department-of-veterans-affairs/Disability-Experience @department-of-veterans-affairs/backend-review-group
 spec/support/vcr_cassettes/carma @department-of-veterans-affairs/vfs-10-10 @department-of-veterans-affairs/va-api-engineers @department-of-veterans-affairs/backend-review-group
 spec/support/vcr_cassettes/central_mail @department-of-veterans-affairs/lighthouse-banana-peels @department-of-veterans-affairs/va-api-engineers @department-of-veterans-affairs/backend-review-group
 spec/support/vcr_cassettes/caseflow @department-of-veterans-affairs/lighthouse-banana-peels @department-of-veterans-affairs/va-api-engineers @department-of-veterans-affairs/backend-review-group
@@ -1876,7 +1876,7 @@ spec/support/vcr_cassettes/slack/slack_bot_notify.yml @department-of-veterans-af
 spec/support/vcr_cassettes/sm_client @department-of-veterans-affairs/vfs-mhv-secure-messaging @department-of-veterans-affairs/va-api-engineers @department-of-veterans-affairs/backend-review-group
 spec/support/vcr_cassettes/spec/support @department-of-veterans-affairs/octo-identity
 spec/support/vcr_cassettes/staccato @department-of-veterans-affairs/vfs-10-10 @department-of-veterans-affairs/va-api-engineers @department-of-veterans-affairs/backend-review-group
-spec/support/vcr_cassettes/token_validation @department-of-veterans-affairs/lighthouse-dash @department-of-veterans-affairs/lighthouse-banana-peels @department-of-veterans-affairs/va-api-engineers @department-of-veterans-affairs/backend-review-group
+spec/support/vcr_cassettes/token_validation @department-of-veterans-affairs/lighthouse-banana-peels @department-of-veterans-affairs/va-api-engineers @department-of-veterans-affairs/backend-review-group
 spec/spupport/vcr_cassettes/user/get_facilities_empty.yml @department-of-veterans-affairs/vfs-facilities-frontend @department-of-veterans-affairs/va-api-engineers @department-of-veterans-affairs/backend-review-group
 spec/support/vcr_cassettes/va_forms @department-of-veterans-affairs/platform-va-product-forms @department-of-veterans-affairs/va-api-engineers @department-of-veterans-affairs/backend-review-group
 spec/support/vcr_cassettes/va_notify @department-of-veterans-affairs/va-notify-write @department-of-veterans-affairs/va-api-engineers @department-of-veterans-affairs/backend-review-group