Added support for [customPostAuthPage] #966

Job	Run time
analyze_and_format; Dart dev; PKGS: _test, _test_package, discoveryapis_commons, discoveryapis_ge...	3m 11s
analyze_and_format; Dart 3.0.0; PKGS: _test, _test_package, discoveryapis_commons, discoveryapis_...	2m 25s
analyze_and_format; Dart 3.2.0; PKGS: googleapis_auth, test_integration; `dart analyze`	41s
mono_repo self validate	33s
unittest; Dart 3.0.0; PKG: discoveryapis_commons; `dart test`	41s
unittest; Dart 3.0.0; PKG: _test_package; `dart test`	39s
unittest; Dart 3.0.0; PKG: generated/googleapis; `dart test`	3m 2s
unittest; Dart 3.0.0; PKG: generated/googleapis_beta; `dart test`	50s
unittest; Dart 3.0.0; PKG: discoveryapis_generator; `dart test`	50s
unittest; Dart 3.2.0; PKG: googleapis_auth; `dart test -p chrome`	2m 21s
unittest; Dart dev; PKG: _test_package; `dart test`	36s
unittest; Dart dev; PKG: discoveryapis_generator; `dart test`	40s
unittest; Dart 3.2.0; PKG: googleapis_auth; `dart test -p vm`	41s
unittest; Dart dev; PKG: discoveryapis_commons; `dart test`	38s
unittest; Dart dev; PKG: generated/googleapis; `dart test`	2m 31s
unittest; Dart dev; PKG: generated/googleapis_beta; `dart test`	41s
unittest; Dart dev; PKG: googleapis_auth; `dart test -p chrome`	2m 17s
unittest; Dart dev; PKG: googleapis_auth; `dart test -p vm`	39s
	23m 56s

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