fix: 26788: (0.78) 0.77 snapshots cannot be loaded, unknown data source metadata field

[artemananiev]

Fix summary: this is the same fix as #26744, which will never be merged to main, as no changes in release 0.79 are needed. That PR will be closed shortly.

Fixes: #26788
Signed-off-by: Artem Ananev artem.ananev@hashgraph.com

[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../java/com/swirlds/merkledb/MerkleDbDataSource.java	33.33%	1 Missing and 1 partial ⚠️

@@                Coverage Diff                 @@
##             release/0.78   #26789      +/-   ##
==================================================
+ Coverage           70.46%   70.49%   +0.03%     
+ Complexity          11675    11674       -1     
==================================================
  Files                2580     2580              
  Lines              108259   108262       +3     
  Branches            12095    12096       +1     
==================================================
+ Hits                76286    76321      +35     
+ Misses              27997    27961      -36     
- Partials             3976     3980       +4     

Files with missing lines	Coverage Δ	Complexity Δ
.../java/com/swirlds/merkledb/MerkleDbDataSource.java	82.35% <33.33%> (-0.30%)	0.00 <0.00> (ø)

... and 15 files with indirect coverage changes

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[testlens-app]

✅ All tests passed ✅

🏷️ Commit: ab24a6e
▶️ Tests: 34718 executed
⚪️ Checks: 62/62 completed

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