[Cleanup] Remove upgrade-cli tool and related build references (opensearch-project#18494)

The `upgrade-cli` tool is deprecated and no longer needed.

- Removed: distribution/tools/upgrade-cli
- Cleaned up: settings.gradle, distribution/build.gradle
- Deleted: distribution/src/bin/opensearch-upgrade(.bat)

Signed-off-by: BeomSeogKim <[email protected]>

Author: BeomSeogKim

.github/dependabot.yml

@@ -445,14 +445,6 @@ updates:
     labels:
       - "dependabot"
       - "dependencies"
-  - directory: /distribution/tools/upgrade-cli/
-    open-pull-requests-limit: 1
-    package-ecosystem: gradle
-    schedule:
-      interval: weekly
-    labels:
-      - "dependabot"
-      - "dependencies"
   - directory: /doc-tools/
     open-pull-requests-limit: 1
     package-ecosystem: gradle

distribution/build.gradle

@@ -312,7 +312,7 @@ configure(subprojects.findAll { ['archives', 'packages'].contains(it.name) }) {
    *             Properties to expand when copying packaging files             *
    *****************************************************************************/
   configurations {
-    ['libs', 'libsPluginCli', 'libsKeystoreCli', 'libsUpgradeCli', 'bcFips'].each {
+    ['libs', 'libsPluginCli', 'libsKeystoreCli', 'bcFips'].each {
       create(it) {
         canBeConsumed = false
         canBeResolved = true
@@ -333,7 +333,6 @@ configure(subprojects.findAll { ['archives', 'packages'].contains(it.name) }) {
 
     libsPluginCli project(':distribution:tools:plugin-cli')
     libsKeystoreCli project(path: ':distribution:tools:keystore-cli')
-    libsUpgradeCli project(path: ':distribution:tools:upgrade-cli')
 
     bcFips libs.bundles.bouncycastle
   }
@@ -356,9 +355,6 @@ configure(subprojects.findAll { ['archives', 'packages'].contains(it.name) }) {
         into('tools/keystore-cli') {
           from(configurations.libsKeystoreCli)
         }
-        into('tools/upgrade-cli') {
-          from(configurations.libsUpgradeCli)
-        }
       }
     }