fix archive path for chromium download (elastic#191953)

## Summary

This PR is a follow up to the work that's been done to make it
relatively straight forward to backport puppeteer updates to the 7.17
branch in elastic#188390.

This change ensures the archive path for chromium doesn't get installed
outside of the kibana directory, the previous expression resulted in an
archive path outside of the kibana directory which unfortunately could
result in a resolution of a path that kibana has no permissions to write
to, depending on where kibana is being executed from.

## How to test
 
- Pull this PR and delete the `.chromium` directory, for whatever
platform this PR is is been tested on we should get no errors about
installing the chromium and we should see the appropriate chromium
archive for the os platform available in the `.chromium` that would get
created.


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### Risk Matrix

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Before closing this PR, invite QA, stakeholders, and other developers to
identify risks that should be tested prior to the change/feature
release.

When forming the risk matrix, consider some of the following examples
and how they may potentially impact the change:

| Risk | Probability | Severity | Mitigation/Notes |

|---------------------------|-------------|----------|-------------------------|
| Multiple Spaces&mdash;unexpected behavior in non-default Kibana Space.
| Low | High | Integration tests will verify that all features are still
supported in non-default Kibana Space and when user switches between
spaces. |
| Multiple nodes&mdash;Elasticsearch polling might have race conditions
when multiple Kibana nodes are polling for the same tasks. | High | Low
| Tasks are idempotent, so executing them multiple times will not result
in logical error, but will degrade performance. To test for this case we
add plenty of unit tests around this logic and document manual testing
procedure. |
| Code should gracefully handle cases when feature X or plugin Y are
disabled. | Medium | High | Unit tests will verify that any feature flag
or plugin combination still results in our service operational. |
| [See more potential risk
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packages/kbn-screenshotting-server/src/paths.test.ts

@@ -0,0 +1,18 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import { ChromiumArchivePaths } from './paths';
+
+describe('ChromiumArchivePaths', () => {
+  it('should download chromium archive to a specific path', () => {
+    const ChromiumArchivePathsInstance = new ChromiumArchivePaths();
+    expect(ChromiumArchivePathsInstance.archivesPath).toEqual(
+      expect.stringContaining('kibana/.chromium')
+    );
+  });
+});

packages/kbn-screenshotting-server/src/paths.ts

@@ -102,7 +102,7 @@ export class ChromiumArchivePaths {
   ];
 
   // zip files get downloaded to a .chromium directory in the kibana root
-  public readonly archivesPath = path.resolve(__dirname, '../../../../../../.chromium');
+  public readonly archivesPath = path.resolve(__dirname, '../../../.chromium');
 
   public find(platform: string, architecture: string, packages: PackageInfo[] = this.packages) {
     return packages.find((p) => p.platform === platform && p.architecture === architecture);