Java: Update the alert messages to better follow the style guide

[erik-krogh]

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The tests are failing, and that's expected (there is an internal PR that updates the expected output).

I've been working on making the alert-messages consistent across languages, and some fan out work from that is ensuring that the alert-messages follow the style guide (which I've also revised).

Fixes done as part of this PR:

• Don't repeat the alert-location as a link.
• Avoid non-descriptive links to "here", or non-descriptive mentions of "here".
• Add single-quotes are code snippets.
• Add full stop at the end of alert-messages.
• Try to get more alert-messages to be consistent with other languages.
• Use "depends on" in taint-tracking queries, and "flows to" in dataflow-queries.

Some of the messages become inconsistent with other languages, but I'm updating one language at a time, so some will get out of sync.

Some other PRs in this series: JS, Py, Rb, Go, C, C# (draft).
Style guide update.

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Side-note: Copilot is great at writing consistent alert-messages. It reads the other tabs I have open.