#1116 Develocity update with tycho caching

Work done:

• Update the Develocity extension to version 2.0, which brings Tycho tests caching support
• Enable caching locally
• Enabled caching on CI (Jenkins)
• Enabled caching of asciidoctor-maven-plugin goals.

Since I'm not an expert in how ESCET build and tests are configured, please let me know if:

• There are other files that are used for tests
• Have any other questions, topics, or concerns that you'd like to clarify or discuss

Please test this well locally, but in general, I see a very good opportunity for build time improvement here, as the ESCET build on CI takes ~20m on average, where ~6m is spent on AsciiDoctor goals and ~4m 45s is spent on Tycho integration tests (example build), which take roughly 50% of time combined, both of which are now using build caching (with this PR).

Addresses #1116 (closed)