Change: always use the same timezone in the logs

[mattmundell]

What

On startup call gvm-libs set_log_tz to specify a single timezone that will be used for all log messages.

Why

Consistent logs are easier to work with.

Example

1. Turn on some logging in gvmd

--- a/src/gvmd_log_conf.cmake_in
+++ b/src/gvmd_log_conf.cmake_in
@@ -15,7 +15,7 @@ prepend=%t %s %p
 separator=:
 prepend_time_format=%Y-%m-%d %Hh%M.%S %Z
 file=${GVM_LOG_DIR}/gvmd.log
-level=127
+level=128

2. Set local timezone to UTC.
3. Start gvmd.
4. Note that logs are in UTC.

md manage:  DEBUG:2024-05-09 14h19.29 utc:247026: sql_open: polling

5. In GSA > My Settings set timezone to America/New_York.
6. Get targets.

$ o m m '<get_targets filter="rows=1 sort=name"/>'

7. Note that the log messages for the get_targets are in UTC (before this PR these with would be in EDT)

md manage:  DEBUG:2024-05-09 14h19.30 utc:247026:    sql: WITH permissions_subject ... FROM targets ...

8. Note that the GMP response is correctly still in EDT

<get_targets_response status="200" status_text="OK">
  <target id="76ddbf65-92ee-4f96-bc5d-0db808bffce2">
    ...
    <creation_time>2024-01-08T07:29:07-05:00</creation_time>

References

Closes #1851.

Requires greenbone/gvm-libs/pull/816.

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