Remove: Drop lcov development dependency in gvmd install instructions

[cfi-gb]

What

From https://packages.debian.org/bookworm/lcov:

Summarise Code coverage information from GCOV

LCOV is an extension of GCOV, a GNU tool which provides information about what parts of a program are actually executed (i.e. "covered") while running a particular test case.

Installing this development dependency would install a huge amount of unnecessary dependencies (currently for my Debian testing system, might be even more on other "more clean" systems):

Summary:
  Upgrading: 0, Installing: 53, Removing: 0, Not Upgrading: 0
  Download size: 5.057 kB
  Space needed: 38,1 MB / 2.276 MB available

but none of the gvmd docs indicates that this is required / mandatory:

https://github.com/search?q=repo%3Agreenbone%2Fgvmd%20lcov&type=code

Could be even possible to drop the remaining parts on the gvmd repo as well if i understand greenbone/gvmd#1740 correctly.

Why

Don't include unnecessary dependencies in the docs.

References

None

Checklist

• Changelog entry

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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