Update tycho.version to v2 (major)

This MR contains the following updates:

Package	Update	Change
org.eclipse.tycho:tycho-p2-plugin	major	1.7.0 -> 2.3.0
org.eclipse.tycho.extras:tycho-buildtimestamp-jgit	major	1.7.0 -> 2.3.0
org.eclipse.tycho:tycho-packaging-plugin	major	1.7.0 -> 2.3.0
org.eclipse.tycho.extras:tycho-source-feature-plugin	major	1.7.0 -> 2.3.0
org.eclipse.tycho:tycho-source-plugin	major	1.7.0 -> 2.3.0
org.eclipse.tycho:target-platform-configuration	major	1.7.0 -> 2.3.0
org.eclipse.tycho:tycho-maven-plugin	major	1.7.0 -> 2.3.0

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