Loosen checks for uids on exfat fs

[kiburtse]

What, How & Why?

Apparently uids on fat32/exfat are assigned not so deterministically on truncate, so try to make simplier checks.

Example failure where most likely uids either stay the same or get completely new values:

[2023/10/30 23:39:13.137] Thread[08]: /System/Volumes/Data/data/mci/6327106b375800ccccaed93352fa5563/realm-core/test/test_file.cpp:588: ERROR in File_GetUniqueID: CHECK(uid1_1 == file2_1.get_unique_id()) failed
[2023/10/30 23:39:13.137] Thread[08]: /System/Volumes/Data/data/mci/6327106b375800ccccaed93352fa5563/realm-core/test/test_file.cpp:589: ERROR in File_GetUniqueID: CHECK(uid2_1 == file1_1.get_unique_id()) failed

or just one failure where it is probably just completely new uid for second file:

[2023/10/29 23:38:40.219] Thread[11]: /System/Volumes/Data/data/mci/60aa25829f9074ec643e693ea7f1f8cd/realm-core/test/test_file.cpp:589: ERROR in File_GetUniqueID: CHECK(uid2_1 == file1_1.get_unique_id()) failed

☑️ ToDos

~ * [ ] 📝 Changelog update ~

• 🚦 Tests (or not relevant)
  ~ * [ ] C-API, if public C++ API changed. ~

[coveralls-official]

Pull Request Test Coverage Report for Build kirill.burtsev_100

• 0 of 5 (0.0%) changed or added relevant lines in 1 file are covered.
• 120 unchanged lines in 13 files lost coverage.
• Overall coverage decreased (-0.009%) to 91.671%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
test/test_file.cpp	0	5	0.0%

Files with Coverage Reduction	New Missed Lines	%
test/test_file.cpp	1	96.53%
test/test_util_network_ssl.cpp	1	90.71%
src/realm/sync/network/http.hpp	2	80.87%
src/realm/sync/network/websocket.cpp	2	75.15%
src/realm/table_view.cpp	2	94.18%
test/fuzz_group.cpp	2	52.57%
test/test_sync.cpp	2	94.03%
src/realm/util/future.hpp	3	95.97%
test/util/compare_groups.cpp	5	54.74%
src/realm/sync/network/network_ssl.hpp	8	85.95%

Totals
Change from base Build 1805:	-0.009%
Covered Lines:	230678
Relevant Lines:	251638

---

💛 - Coveralls