Add unit test report generator

plugins/src/main/java/com/google/firebase/gradle/plugins/report/ReportCommit.kt

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+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.firebase.gradle.plugins.report
+
+/**
+ * @param sha Commit SHA.
+ * @param pr GitHub PR number that was squashed to create this commit. Used only for display purposes, does not affect logic.
+ */
+data class ReportCommit(val sha: String, val pr: Int)

plugins/src/main/java/com/google/firebase/gradle/plugins/report/TestReport.kt

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+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.firebase.gradle.plugins.report
+
+
+/**
+ * Represents a single run of a test in CI. One unit/implementation test workflow run creates many `TestReport`s, one for each tested SDK.
+ * @param name SDK name of the associated test run.
+ * @param type What type of test result this is, either unit or instrumentation test.
+ * @param status Conclusion status of the test run, `SUCCESS`/`FAILURE` for typical results, `OTHER` for ongoing runs and unexpected data.
+ * @param commit Commit SHA this test was run on.
+ * @param url Link to the GHA test run info, including logs.
+ */
+data class TestReport(
+  val name: String,
+  val type: Type,
+  val status: Status,
+  val commit: String,
+  val url: String,
+) {
+  enum class Type {
+    UNIT_TEST,
+    INSTRUMENTATION_TEST,
+  }
+
+  enum class Status {
+    SUCCESS,
+    FAILURE,
+    OTHER,
+  }
+}