[tycho-4.0.x] Improve errors handling while downloading p2 artifacts from repository

[eclipse-tycho-bot]

Backport

This will backport the following commits from main to tycho-4.0.x:

• Improve errors handling while downloading p2 artifacts from repository

Questions ?

Please refer to the Backport tool documentation

[github-actions[bot]]

Test Results

  600 files  +3    600 suites  +3   3h 52m 11s :stopwatch: - 3m 27s   419 tests +1    413 :white_check_mark: +2   6 :zzz: ±0  0 :x: ±0  1 257 runs  +3  1 238 :white_check_mark: +4  19 :zzz: ±0  0 :x: ±0 

Results for commit a1222a07. ± Comparison against base commit 900f0c62.