exploring basic Pendo tracking

[smithjw1]

Description

This is a jumping off point to adding Pendo tracking to the WordPress admin. When you wanted to include Pendo, you could insert the tracking code with a hook like:

use Automattic\VIP\Telemetry\Pendo;
function insert_pendo() {
	$pendo = new Pendo();
	$pendo->include_script();
}
add_action( 'admin_enqueue_scripts', 'insert_pendo', 10, 3 );

The plan is to enable Pendo tracking when a customer is using PCH or Composable to start, with future integrations. We only want to enable this once, so we may want to invoke it outside of those integrations and check to see if they are running.

There are some missing pieces, so this draft PR shouldn't be merged as is, but is posted here as a way to further the implementation discussion.

Pre-review checklist

Please make sure the items below have been covered before requesting a review:

• This change works and has been tested locally or in Codespaces (or has an appropriate fallback).
• This change works and has been tested on a sandbox.
• This change has relevant unit tests (if applicable).
• This change uses a rollout method to ease with deployment (if applicable - especially for large scale actions that require writes).
• This change has relevant documentation additions / updates (if applicable).
• I've created a changelog description that aligns with the provided examples.

Pre-deploy checklist

• VIP staff: Ensure any alerts added/updated conform to internal standards (see internal documentation).

Steps to Test

The logic will not fire Pendo anywhere but on production, so local testing isn't possible.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 41 lines in your changes missing coverage. Please review.

Project coverage is 30.49%. Comparing base (c82dc65) to head (614431e).
Report is 27 commits behind head on develop.

Files with missing lines	Patch %	Lines
telemetry/class-pendo.php	0.00%	26 Missing ⚠️
telemetry/pendo/pendo-utils.php	0.00%	15 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #6048      +/-   ##
=============================================
- Coverage      30.51%   30.49%   -0.02%     
- Complexity      4811     4824      +13     
=============================================
  Files            289      291       +2     
  Lines          21181    21228      +47     
=============================================
+ Hits            6463     6474      +11     
- Misses         14718    14754      +36     

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[sonarqubecloud]

Quality Gate passed

Issues
7 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud