AAD B2C support notice for articles

[guardrex]

Fixes #36366

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[wadepickett]

I think it would be better to keep any details on how support continues (dates and conditions etc.) out of this note and rely on the central support details page where it is reviewed and controlled by the pertinent stakeholders.

(I am out of office Monday 11/24 to 11/25.)

[guardrex]

@wadepickett @tdykstra ... Let's see if we can get this cooking on our own. Wade, I took your suggestion and killed some of the verbiage. I just leave the EOL date for new customers in place. I'm also going to move it to the main doc set includes in a minute. I plan to place it widely where B2C has primary coverage. I'll do both on the next commit.

UPDATE: Done! 👍 ... I moved the INCLUDES file and found strategic locations for the notice. I also just zapped some spots where B2C was mentioned and not necessary to state.

For one section, I had to open an issue ... #36615. That's going to take too long to address, OR I just didn't want to make the call myself on cutting the B2C example out of the section.

[guardrex]

Ping @wadepickett @tdykstra for review.

[tdykstra]

All of the files should have ms.date.updated.

[guardrex]

I'll update the non-Blazor article dates. Blazor articles use a different ms.date update approach than the rest of the doc set. Blazor docs are updated annually at release, unless the update is a major overhaul.