Use shipping .version file from the SDK archive

[ViktorHofer]

See dotnet/sdk#47076 (comment) for more information.

The .version file that is included in the Private.SourceBuild.Artifacts archive contains a .version file. Its inputs are two parameters: https://github.com/dotnet/dotnet/blob/2ba44e0dca33456408ebd3b6a6cb3ed910554078/eng/finish-source-only.proj#L276-L278

The SourceBuiltSdkNonStableVersion property is already read from SDK's .version file. The RepositoryCommit is or will be the same between sdk and the VMR as we build all repos from the same commit.

I think we can just use sdk's .version file instead of creating one for SB artifacts package.

[MichaelSimons]

[Triage] From the past, we think the SDK versions file is different in that it contains stable and non-stable versions. This shouldn't matter however as this is primarily intended for identifying the sdk the artifacts were produced from for human purposes.

[MichaelSimons]

[Triage] When fixing, please ensure the appropriate tests are in place if they don't already exist to ensure version correctness.

[NikolaMilosavljevic]

I've checked the recent build; SDK's version file has more entries which is expected. The first 2 rows currently match.

PSB archive's .version file:

3725b139a5b6927a7a19577568a7a6b1bfe4d576
10.0.100-rc.1.25454.104

SDK's .version file:

3725b139a5b6927a7a19577568a7a6b1bfe4d576
10.0.100-rc.1.25454.104
fedora.41-x64
10.0.100-rc.1.25454.104
10.0.100

We did see regressions in the past when SDK expanded the contents of this file, to include multiple different versions, and version in row 2 was different than version in row 4, which was the one we wanted in PSB archive. I'll double-check how this is now generated in sdk repo and proceed with this change if appropriate.

[NikolaMilosavljevic]

If the .version file in PSB archive is only used for human purposes, to quickly identify the SDK version with which the artifacts were produced, I believe we can stop creating a new file and, instead, copy the SDK file, as is.

.version file in PSB archive would always contain the VMR SHA and the unstable SDK version. .version file in SDK is slightly different and contains more data, as outlined in my previous message.

PSB file does not differ whether we are building a preview of a release, GA/RTM or a servicing release, so we have something like:

3725b139a5b6927a7a19577568a7a6b1bfe4d576
10.0.100-rc.1.25454.104

SDK file for a preview is this:

3725b139a5b6927a7a19577568a7a6b1bfe4d576
10.0.100-rc.1.25454.104
fedora.41-x64
10.0.100-rc.1.25454.104
10.0.100

Note that the 2nd and 4th line are the same, unstable version. The important change comes for GA and servicing builds - 2nd line will become the stable version. 4th line will still contain the unstable version.

@dotnet/distro-maintainers - can you weigh in on this proposed change?