[backport -> release/3.4.x] fix(dns): Eliminate asynchronous timer in syncQuery() to prevent hang

[chobits]

backport #11900 and #11386 to 3.4.x

Summary

1. fix(dns): eliminate asynchronous timer in syncQuery() to prevent deadlock risk (fix(dns): Eliminate asynchronous timer in syncQuery() to prevent hang risk #11900)

    * Revert "fix(conf): set default value of `dns_no_sync` to `on` (#11869)"
     
    This reverts commit 3be2513a60b9f5f0a89631ff17c202e6113981c0.

    * fix(dns): introduce the synchronous query in syncQuery() to prevent hang risk

    Originally the first request to `syncQuery()` will trigger an asynchronous timer
    event, which added the risk of thread pool hanging.

    With this patch, cold synchronously DNS query will always happen in the current
    thread if current phase supports yielding.

2. fix(dns): fix retry and timeout handling (fix(dns): fix retry and timeout handling #11386)

    - Stop retrying in dns/client.lua, let the resolver handle this.  This
       change also makes it possible to disable retries, which previously
       was not possible
     - Be more faithful to the timeouts set by the user.  Previously, the
       timeout configured was used only for the ultimate request sent to
       the DNS server, but asynchronous requests allowed longer timeouts
       which was not transparent.
     - When the DNS server fails, stop trying other query types.  Previously,
       the behavior was such that after an (intermediate) failure to query
       for one record type (say "SRV"), the client would try the next record
       type (say "A") and succeed with that.  It would then return the
       contents of the "A" record even if the "SRV" record pointed to a
       different address.
     - Change domain names used for testing the DNS client into the
       kong-gateway-testing.link zone, which is controlled by the Kong Gateway
       team.

    Fixes https://github.com/Kong/kong/issues/10182
    KAG-2300

Checklist

• The Pull Request has tests
• A changelog file has been created under changelog/unreleased/kong or skip-changelog label added on PR if changelog is unnecessary. README.md
• There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HERE

Full changelog

• [Implement ...]

Issue reference

Fix #[issue number]