Do not coerce ECOSYSTEM to SEMVER for ecosystems that do not strictly adhere to SEMVER

[andrewpollock]

Describe the bug
OSV.dev coerces to SEMVER records it imports for specific ecosystems, regardless of what version type the source has published, e.g. GitHub Advisory Database and the Go ecosystem

To Reproduce
Compare and contrast:

• https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/10/GHSA-mwwc-3jv2-62j3/GHSA-mwwc-3jv2-62j3.json
• https://api.osv.dev/v1/vulns/GHSA-mwwc-3jv2-62j3

Expected behaviour
A record's type field is preserved as published

Screenshots
Compare and contrast:

• https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/10/GHSA-mwwc-3jv2-62j3/GHSA-mwwc-3jv2-62j3.json
• https://api.osv.dev/v1/vulns/GHSA-mwwc-3jv2-62j3

Additional context
Credit to @Churro for surfacing this:

• https://gist.github.com/Churro/976f3161f3b911b88d049fa9f4a37256
• https://gist.github.com/Churro/dc84f10ad69536ae19af9f9c53ba219d
• https://gist.github.com/Churro/304facf9f87d7fba38ad9363eb2d3772

[github-actions]

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[oliverchang]

Some more context here: ossf/osv-schema#314

[github-actions]

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