[Reporting] Make "Run diagnostics" be a clickable link

[tsullivan]

Summary

Closes #121056

Testing

I used MacOS for development, which can not lack system dependencies. To force an error that would show a documentation link, I hacked the diagnostics route handler with this patch:

diff --git a/x-pack/plugins/reporting/server/routes/diagnostic/browser.ts b/x-pack/plugins/reporting/server/routes/diagnostic/browser.ts
index 53046a8680c..fd5364b1343 100644
--- a/x-pack/plugins/reporting/server/routes/diagnostic/browser.ts
+++ b/x-pack/plugins/reporting/server/routes/diagnostic/browser.ts
@@ -61,7 +61,7 @@ export const registerDiagnoseBrowser = (reporting: ReportingCore, logger: Logger
             helpTexts.push(helpText);
           }
           return helpTexts;
-        }, []);
+        }, [logsToHelpMap['error while loading shared libraries']]);

         const response: DiagnosticResponse = {
           success: boundSuccessfully && !help.length,

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: c089d74

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
reporting	58.6KB	58.7KB	+40.0B

History

• 💚 Build #76729 succeeded 8506592
• 💚 Build #76717 succeeded d0bab06

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