Upgrade to .Net 8.0

[dylan-smith]

Updated to .Net 8 (and C#12).

Previously we were on .Net 6 which goes out of support on Nov 12, 2024.

But the real motivator was being able to use C# 12 which introduces some nice features to make the syntax more concise (especially primary constructors).

• [X] Did you write/update appropriate tests
• [ ] Release notes updated (if appropriate)
• [X] Appropriate logging output
• [ ] Issue linked
• [X] Docs updated (or issue created)
• [X] New package licenses are added to ThirdPartyNotices.txt (if applicable)

[github-actions[bot]]

Unit Test Results

813 tests   813 ✅  23s ⏱️   1 suites    0 💤   1 files      0 ❌

Results for commit 3ed6a7c8.

:recycle: This comment has been updated with latest results.

[github-actions[bot]]

Package	Line Rate	Branch Rate	Complexity	Health
gei	79%	69%	527	✔
ado2gh	84%	78%	631	✔
Octoshift	87%	77%	1305	✔
bbs2gh	78%	72%	662	✔
Summary	83% (6839 / 8197)	75% (1568 / 2096)	3125	✔