codewhisperer: fix java test file regex pattern MyClassTests.java not captured by test supplemental context(#3763)

Author: Will-ShaoHua

.changes/next-release/Bug Fix-d47847cc-bbb7-4c26-a102-82943152654a.json

@@ -0,0 +1,4 @@
+{
+	"type": "Bug Fix",
+	"description": "CodeWhisperer: fix java test file name MyClassTests.java (plural) will not be captured if file is not living in a test folder"
+}

src/codewhisperer/util/supplementalContext/codeParsingUtil.ts

@@ -19,7 +19,7 @@ export const utgLanguageConfigs: Record<string, utgLanguageConfig> = {
     // Java regexes are not working efficiently for class or function extraction
     java: {
         extension: '.java',
-        testFilenamePattern: /(?:Test([^/\\]+)\.java|([^/\\]+)Test\.java)$/,
+        testFilenamePattern: /(?:Test([^/\\]+)\.java|([^/\\]+)Test\.java|([^/\\]+)Tests\.java)$/,
         functionExtractionPattern:
             /(?:(?:public|private|protected)\s+)(?:static\s+)?(?:[\w<>]+\s+)?(\w+)\s*\([^)]*\)\s*(?:(?:throws\s+\w+)?\s*)[{;]/gm, // TODO: Doesn't work for generice <T> T functions.
         classExtractionPattern: /(?<=^|\n)\s*public\s+class\s+(\w+)/gm, // TODO: Verify these.

src/test/codewhisperer/util/codeParsingUtil.test.ts

@@ -63,7 +63,7 @@ describe('RegexValidationForJava', () => {
 
 describe('isTestFile', () => {
     it('should return true if the file name matches the test filename pattern - Java', async () => {
-        const filePaths = ['/path/to/MyClassTest.java', '/path/to/TestMyClass.java']
+        const filePaths = ['/path/to/MyClassTest.java', '/path/to/TestMyClass.java', '/path/to/MyClassTests.java']
         const language = 'java'
 
         for (const filePath of filePaths) {