fix: populate version in assets_versions for 1st entry

[sudo-suhas]

• Set version to 0.1 while inserting the first version of asset into assets_versions table.
• Update all rows in assets_versions to have 0.1 as the version if the column was not populated.

[coveralls]

Pull Request Test Coverage Report for Build 4511695319

• 8 of 12 (66.67%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.002%) to 86.151%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/store/postgres/asset_repository.go	8	12	66.67%

Files with Coverage Reduction	New Missed Lines	%
internal/store/postgres/asset_repository.go	1	77.5%

Totals
Change from base Build 4509469872:	0.002%
Covered Lines:	5014
Relevant Lines:	5820

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💛 - Coveralls