Remove DataPayload::from_borrowed

[sffc]

Step toward #752

This PR removes the public function DataPayload::from_borrowed. It does not actually remove the variant, because doing so will require performing the large refactor that removes the second lifetime argument; I would rather do that in its own PR (coming next after this one).

[sffc]

@nordzilla I had to add a second lifetime parameter to FormattedZonedDateTime because the lifetime on the ZonedDateTimeFormat can be different than the lifetime of the borrow. I ran into this when refactoring the DateTime test.

[codecov-commenter]

Codecov Report

Merging #898 (ef4e9db) into main (f5bc166) will increase coverage by 0.02%.
The diff coverage is 86.36%.

@@            Coverage Diff             @@
##             main     #898      +/-   ##
==========================================
+ Coverage   74.31%   74.34%   +0.02%     
==========================================
  Files         210      206       -4     
  Lines       12475    12352     -123     
==========================================
- Hits         9271     9183      -88     
+ Misses       3204     3169      -35     

Impacted Files	Coverage Δ
provider/core/src/erased.rs	76.28% <50.00%> (-6.60%)	⬇️
provider/core/src/data_provider/test.rs	91.95% <87.50%> (+0.08%)	⬆️
components/decimal/src/grouper.rs	93.10% <100.00%> (+0.12%)	⬆️
provider/core/src/data_provider.rs	83.11% <100.00%> (+5.61%)	⬆️
provider/core/src/marker/impls.rs	100.00% <100.00%> (ø)
provider/core/src/struct_provider.rs	85.71% <100.00%> (ø)
components/datetime/src/provider/gregory.rs	63.01% <0.00%> (-12.33%)	⬇️
utils/yoke/src/zero_copy_from.rs	75.00% <0.00%> (-2.78%)	⬇️
provider/core/src/dynutil.rs	37.14% <0.00%> (-1.75%)	⬇️
... and 10 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f5bc166...ef4e9db. Read the comment docs.

[coveralls]

Pull Request Test Coverage Report for Build eb8f822e9972edf8a3325c76cd10ecb87a4b6c6f-PR-898

• 38 of 44 (86.36%) changed or added relevant lines in 6 files are covered.
• 19 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.07%) to 74.411%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
provider/core/src/erased.rs	2	4	50.0%
provider/core/src/data_provider/test.rs	28	32	87.5%

Files with Coverage Reduction	New Missed Lines	%
experimental/provider_ppucd/src/parse_ppucd.rs	1	93.29%
provider/core/src/data_provider/test.rs	3	91.95%
provider/core/src/erased.rs	6	76.29%
components/datetime/src/provider/gregory.rs	9	63.01%

Totals
Change from base Build f5bc1660a2efa1c88f6ab3ee7a6e68af92498ffd:	-0.07%
Covered Lines:	9314
Relevant Lines:	12517

---

💛 - Coveralls