build: retry transient JDT LS p2 downloads

The JDT LS snapshot repository has no p2 mirrors, and Tycho 4.0.5 does not retry a direct connection reset. Let Azure Pipelines retry the build-plugin task on the same agent so the Maven and p2 caches are reused and only the missing artifact is fetched again.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: ac225268-483d-4498-a08f-fe79a87d4d2e

Author: wenytang-ms

.azure-pipelines/vscode-java-test-ci.yml

@@ -58,6 +58,10 @@ extends:
                 displayName: npm run lint
               - script: npm run build-plugin
                 displayName: npm run build-plugin
+                # The JDT LS snapshot p2 site has no mirrors, and Tycho 4.0.5
+                # does not retry a direct connection reset. A task retry reuses
+                # the Maven/p2 cache and fetches only the missing artifact.
+                retryCountOnTaskFailure: 2
                 # System.AccessToken is a secret, and Azure Pipelines does not export secret
                 # variables to the environment -- not even through a variable that merely
                 # references one. It is mapped here, on the step that actually runs Maven,

.azure-pipelines/vscode-java-test-nightly.yml

@@ -74,6 +74,10 @@ extends:
                 displayName: npm run lint
               - script: npm run build-plugin
                 displayName: npm run build-plugin
+                # The JDT LS snapshot p2 site has no mirrors, and Tycho 4.0.5
+                # does not retry a direct connection reset. A task retry reuses
+                # the Maven/p2 cache and fetches only the missing artifact.
+                retryCountOnTaskFailure: 2
                 # System.AccessToken is a secret, and Azure Pipelines does not export secret
                 # variables to the environment -- not even through a variable that merely
                 # references one. It is mapped here, on the step that actually runs Maven,

.azure-pipelines/vscode-java-test-rc.yml

@@ -69,6 +69,10 @@ extends:
                 displayName: npm run lint
               - script: npm run build-plugin
                 displayName: npm run build-plugin
+                # The JDT LS snapshot p2 site has no mirrors, and Tycho 4.0.5
+                # does not retry a direct connection reset. A task retry reuses
+                # the Maven/p2 cache and fetches only the missing artifact.
+                retryCountOnTaskFailure: 2
                 # System.AccessToken is a secret, and Azure Pipelines does not export secret
                 # variables to the environment -- not even through a variable that merely
                 # references one. It is mapped here, on the step that actually runs Maven,