Bypass SwiftLint using ACTION instead of CONFIGURATION (#24094)

* Bypass SwiftLint using `ACTION` instead of `CONFIGURATION`

Co-authored-by: Olivier Halligon <olivier.halligon@automattic.com>

Follows up on
#23996 (comment)

Makes the logic more precise, given the error occurs when archiving.

* Add note about inconsistent failure when archiving locally

Scripts/BuildPhases/SwiftLint.sh

@@ -8,15 +8,16 @@ if [ -n "${CI+x}" ]; then
   exit 0
 fi
 
-# Only run on debug builds.
-# For some reason, running when trying to archive, via CLI, results in a compilation failure.
+# Do not run when archiving (ACTION = install).
+#
+# For some reason, running when trying to archive, via CLI, results in a compilation failure at times.
 #
 # fatal error: module 'WordPressSharedObjC' in AST file '/path/to/DerivedData/ModuleCache.noindex/EQUUY9BHSJ5N/WordPressSharedObjC-5G93B85NZ09I.pcm'
 # (imported by AST file '/Users/gio/Developer/a8c/wpios/DerivedData/WordPress/Build/Intermediates.noindex/ArchiveIntermediates/WordPress Alpha/PrecompiledHeaders/WordPress-Bridging-Header-swift_1L0UBHDEION2G-clang_EQUUY9BHSJ5N.pch')
 # is not defined in any loaded module map file;
 # maybe you need to load '/Users/gio/Developer/a8c/wpios/DerivedData/WordPress/Build/Intermediates.noindex/ArchiveIntermediates/WordPress Alpha/IntermediateBuildFilesPath/GeneratedModuleMaps-iphoneos/WordPressSharedObjC.modulemap'?
-if [ "${CONFIGURATION}" != "Debug" ]; then
-  echo 'Running in a build configuration other than Debug. Skipping SwiftLint in production builds.'
+if [ "${ACTION}" == "install" ]; then
+  echo "info: Running during archival (detected ACTION = $ACTION). Skipping SwiftLint because of a build failure during archival we are yet to investigate."
   exit 0
 fi