URL in error message ends with full stop that isn't part of URL

### Description of the bug:

The URL in a toolchain resolution error message ends with a full stop that doesn't belong to the URL but signifies the end of a sentence. As there's no whitespace between the full stop and the URL, tools that auto-link URLs often wrongly interpret the full stop to be part of the URL.

It's better to get rid of the full stop to avoid ambiguity.

Encountered here: https://github.com/corneliusroemer/datasets/actions/runs/15280542858/job/42978171688#step:5:50

### Which category does this issue belong to?

Java Rules, Core, CLI, Documentation

Tracking issue for #26168

Start with the toolchain resolution error shown in the linked GitHub Actions log and locate the source of its message. Remove the sentence-ending full stop after the URL, then verify that the displayed URL no longer includes punctuation when auto-linked.

Written by the indexing model from the issue text.