[MNG-7770] Implement workaround for MNG-7758/MRESOLVER-335

**[Michael Osipov](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=michael-o)** opened **[MNG-7770](https://issues.apache.org/jira/browse/MNG-7770?redirect=false)** and commented

Details see tickets.

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**Affects:** 3.8.8, 3.9.1, 4.0.0-alpha-5

**Sub-tasks:**
- [MNG-7771](https://issues.apache.org/jira/browse/MNG-7771) Don't use ArtifactResolutionException#getMessage() w/o knowing whether there are other exceptions or not

**Issue Links:**
- [MNG-7758](https://issues.apache.org/jira/browse/MNG-7758) o.e.aether.resolution.ArtifactResolutionException incorrectly examined when multiple repositories are involved
(_**"is caused by"**_)
- [MRESOLVER-335](https://issues.apache.org/jira/browse/MRESOLVER-335) Better resolver errors for Artifact Not Found
(_**"is caused by"**_)
- [DOXIASITETOOLS-303](https://issues.apache.org/jira/browse/DOXIASITETOOLS-303) Implement workaround for MNG-7758/MRESOLVER-335

**Backported to:** [3.9.x-candidate](https://github.com/apache/maven/milestone/112?closed=1)

Start by reading the linked MNG-7758 and MRESOLVER-335 tickets, then review sub-task MNG-7771 for the specific exception-handling requirement. The issue indicates that a workaround is needed for resolver errors and that it was backported to the 3.9.x-candidate milestone; completion should address those linked cases.

Written by the indexing model from the issue text.