feat: adding cobertura coverage reporter (projen#1504)

GitLab CI [natively supports](https://docs.gitlab.com/ee/user/project/merge_requests/test_coverage_visualization.html#javascript-example) `cobertura` for coverage reporting while the reporter can be added to a project with ` this.jest.config?.coverageReporters.push('cobertura')`, I think it's an easy addition to just add it to default reporters --- By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
FitX · Jan 11, 2022 · a71ea69 · a71ea69
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Showing 4 changed files with 9 additions and 3 deletions.
diff --git a/API.md b/API.md
@@ -13934,7 +13934,7 @@ Name | Type | Description
 **coverageDirectory**?🔹 | <code>string</code> | The directory where Jest should output its coverage files.<br/>__*Default*__: "coverage"
 **coveragePathIgnorePatterns**?🔹 | <code>Array<string></code> | An array of regexp pattern strings that are matched against all file paths before executing the test.<br/>__*Default*__: "/node_modules/"
 **coverageProvider**?🔹 | <code>string</code> | Indicates which provider should be used to instrument code for coverage.<br/>__*Default*__: "babel"
-**coverageReporters**?🔹 | <code>Array<string></code> | A list of reporter names that Jest uses when writing coverage reports.<br/>__*Default*__: ["json", "lcov", "text", "clover"]
+**coverageReporters**?🔹 | <code>Array<string></code> | A list of reporter names that Jest uses when writing coverage reports.<br/>__*Default*__: ["json", "lcov", "text", "clover", "cobertura"]
 **coverageThreshold**?🔹 | <code>[javascript.CoverageThreshold](#projen-javascript-coveragethreshold)</code> | Specify the global coverage thresholds.<br/>__*Default*__: undefined
 **dependencyExtractor**?🔹 | <code>string</code> | This option allows the use of a custom dependency extractor.<br/>__*Default*__: undefined
 **displayName**?🔹 | <code>any</code> | Allows for a label to be printed alongside a test while it is running.<br/>__*Default*__: undefined

diff --git a/package.json b/package.json
diff --git a/src/javascript/jest.ts b/src/javascript/jest.ts
@@ -72,7 +72,7 @@ export interface JestConfigOptions {
 
   /**
    * A list of reporter names that Jest uses when writing coverage reports. Any istanbul reporter can be used
-   * @default - ["json", "lcov", "text", "clover"]
+   * @default - ["json", "lcov", "text", "clover", "cobertura"]
    */
   readonly coverageReporters?: string[];
 
@@ -598,6 +598,7 @@ export class Jest {
       "json",
       "lcov",
       "clover",
+      "cobertura",
     ];
     this.testMatch = this.jestConfig?.testMatch ?? [
       "**/__tests__/**/*.[jt]s?(x)",

diff --git a/test/__snapshots__/integ.test.ts.snap b/test/__snapshots__/integ.test.ts.snap