#2354 Follow-up: Redesign PollKube discovery using PeriodicTimer

[raman-m]

Follow up #2354

• #2344 Upgrade solutions to Visual Studio 2026 format #2354
• and commit 070593c

Proposed Changes

• Added the Dispose pattern for logging and Kube polling
• Fixed xUnit1051 warnings, which is a best practice when writing xUnit tests after migrating to the xUnit v3 framework
• ❗Redesigned the PollKube discovery provider to utilize PeriodicTimer, which was introduced in .NET 8
• Temporarily disabled PollKube acceptance tests since the work is in progress

[raman-m]

Hello @ggnaegi!
Please review if you have time, or at least take a look at this piece of my art 😄 I have an idea to reuse passive polling in the PollKube provider, as it was implemented by you in the PollConsul provider. I'm calling it "passive polling."

In this PR, I am working on implementing another polling strategy, aka "active polling," which is based on PeriodicTimer callbacks, replacing old Timer callbacks as proposed by Tom earlier. After the release, we could unify both polling strategies and propose a service discovery option to switch between them.

P.S. Please note that the PollKube acceptance tests have been temporarily disabled, as the provider and tests are still under development . However, I plan to release the Ocelot beta version in 1-2 days, which should be well-received by the community as it will facilitate the much-awaited migration to the .NET 10 SDK.