VPN-6616 and VPN-6617: Addon messages for 2.25

[mcleinman]

Description

This is the first update message that uses the new "shared strings" file. Incredibly, we only are adding 2 translatable strings that will only be used for this version, instead of 15 that it would have been in the old version.

This PR also includes a small fix (and target.text) that allows successful builds when developing addons using shared strings.

There are two other addon-related PRs that are currently in review:

• VPN-6749: Fix shared addon ids #10065 - fixes a bug in the string IDs for shared strings
• FXVPN-32 add message (and fix bug involving lists and shared strings) #10045 - This is the first (non-update) message to use shared strings. It includes a fix for lists that is replicated in this PR (needed for testing), along with a fix for some tests that is not replicated here.

This PR cannot be merged into main before #10065 is merged into main, to ensure we don't add bad translation IDs. #10065 was merged.

Linter failures are fixed in #10045 - that either needs to be merged in first, or have the code change replicated in this PR

This is what it looks like:

Reference

VPN-6616 and VPN-6617

Checklist

• My code follows the style guidelines for this project
• I have not added any packages that contain high risk or unknown licenses (GPL, LGPL, MPL, etc. consult with DevOps if in question)
• I have performed a self review of my own code
• I have commented my code PARTICULARLY in hard to understand areas
• I have added thorough tests where needed

[mcleinman]

This is ready for review - I've put it on draft as a reminder to not merge it before #10065.

[mcleinman]

Taking off draft as #10065 is merged