[c++] Depend on core 2.17.0

[johnkerl]

Issue and/or context: For #866. The "real" PRs are #1519, #1511, and #1559 which are at the moment depending on core 2.17.0-rc0. On this PR, if CI passes, I'll attempt to first merge solely the core-dependency change -- and then the big three PRs will be able to be rebased on top of this once it's merged.

Changes:

• Core 2.17.0
• [python] Update default-filter-list handling in unit tests #1676 redux
• TileDB-Py 0.23.0
• TileDB-R 0.21.0

Notes for Reviewer:

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[eddelbuettel]

This is internally consistent in ensuring "2.17.0 and its resulting API packages shall be used".

But the practical problem is that we don't have them yet as binaries. Not at Conda (feedstock issue), not at r2u. We do have them at r-universe and as source at CRAN. Close but is it close enough?

[johnkerl]

Conda is for later in our release procedure:
https://github.com/single-cell-data/TileDB-SOMA/wiki/Branches-and-releases

Green CI matters for this PR.

This Python/R interop which has been solidly quietly green for months is now vexing me.

[johnkerl]

I'll merge this PR as it fixes things needing fixed. But Python/R interop remains to be solved.

[johnkerl]

I'll debug the interop first thing tomorrow.