HPOS: Add descriptive document titles to HPOS order admin screens

[coreymckrill]

Changes proposed in this Pull Request:

Updates the <title> tag on Orders admin screens to more closely match what is used for CPT order screens. One slight difference is that on the Edit order screen, the HPOS title will show the order ID number instead of the order date.

How to test the changes in this Pull Request:

1. Check the behavior on trunk before checking out this branch.
2. Ensure that the HPOS feature is turned on (WooCommerce > Settings > Features) but have the posts table set as authoritative.
3. View the orders list table screen and note the title of the document (usually shown in the "tab" part of a browser tab).
4. Do the same for the Edit order screen and the Add new order screen.
5. Now change the HPOS settings to make the customer order tables authoritative.
6. View the same orders screens and note that all of them show the same thing instead of being relevant to the current screen.
7. Now check out this branch and repeat the process. The document titles on the Edit and Add new screens show now be similar regardless of which HPOS mode is used.

[github-actions]

Hi @jorgeatorres,

Apart from reviewing the code changes, please make sure to review the testing instructions as well.

You can follow this guide to find out what good testing instructions should look like:
https://github.com/woocommerce/woocommerce/wiki/Writing-high-quality-testing-instructions

[github-actions]

Test Results Summary

Commit SHA: a146ed0

Test 🧪	Passed ✅	Failed 🚨	Broken 🚧	Skipped ⏭️	Unknown ❔	Total 📊	Duration ⏱️
API Tests	259	0	0	2	0	261	0m 46s
E2E Tests	195	0	0	10	0	205	16m 11s

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To view the full API test report, click here.
To view the full E2E test report, click here.
To view all test reports, visit the WooCommerce Test Reports Dashboard.

[jorgeatorres]

LGTM. Thank you @coreymckrill!