build: stop replacing built artifacts with the previous snapshot's

[joaodinissf]

Why the change

Every build swapped in the published snapshot's copy of any artifact whose version it had already published; after two same-minute merges that swap breaks the master snapshot and every PR build.

Special things to note

• Qualifiers are commit times to the minute. fix(xtext): match case-sensitive pattern lookups against the candidate name #1551 and fix(xtext.ui): iterate a snapshot of the matches when showing a running search #1552 were merged 9 seconds apart and both changed bundles of the runtime feature, so both builds gave it 19.2.1.v20260928-2242 with different content. The build then replaced this build's feature with fix(xtext): match case-sensitive pattern lookups against the candidate name #1551's, which pins xtext.ui 17.3.3 where this build has 17.3.4, and resolving com.avaloq.tools.ddk.feature fails. The master snapshot has been red since, and so is every PR that does not touch a runtime-feature bundle.
• Without the swap, each build publishes what it built. Checked on 962cabd: with the swap, the exact CI error; without it, BUILD SUCCESS with the runtime feature pinning xtext.ui 17.3.4.
• Trade-off: after a same-minute collision two snapshots can carry different content under one version. That only affects snapshots; the version check against the last release is unchanged. Making every build's version unique is a separate change.

Change outline

 ddk-parent/pom.xml
-  <snapshot.repo.url>…/p2/snapshots/latest/</snapshot.repo.url>
-  tycho-p2-plugin <baselineRepositories> = ${snapshot.repo.url}

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