Ensure API sessions are restored before starting the HTTP server

[DL6ER]

What does this implement/fix?

Restore API sessions way ahead of starting the web server to ensure we are not falsely rejecting still valid sessions. This is a regression of the asynchronous query importing as the thread importing the queries may get queued to only be able to restore the API sessions once history importing is done. This can take some time on slow devices.

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Related issue or feature (if applicable): Fixes #2802

Pull request in docs with documentation (if applicable): N/A

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1. I have read and understood the contributors guide, as well as this entire template. I understand which branch to base my commits and Pull Requests against.
2. I have commented my proposed changes within the code.
3. I am willing to help maintain this change if there are issues with it later.
4. It is compatible with the EUPL 1.2 license
5. I have squashed any insignificant commits. (git rebase)

Checklist:

• The code change is tested and works locally.
• I based my code and PRs against the repositories development branch.
• I signed off all commits. Pi-hole enforces the DCO for all contributions
• I signed all my commits. Pi-hole requires signatures to verify authorship
• I have read the above and my PR is ready for review.

[yubiuser]

The issue you tried to fix with your last commit

216/216 ✗ FTL terminates with message
(in test file test/test_suite.bats, line 2352)
`[[ $status == 0 ]]' failed

Did not find string "########## FTL terminated after" in file /var/log/pihole/FTL.log within 30 seconds

Happens for unkown reasons from time-to-time on Github. Usually, it's enough to restart the workflow. I just did it and the test passed now for amd64.
I suggest you push away the last commit.

[yubiuser]

I build a local image and with this FTL binary adding/removing CNAMES and switching pages works fine without logout.

[yubiuser]

Assuming RISCV will finish one day and pass - could you please squash this down to two commits?

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/webserver-session-timeout/85197/40