chore: add missing server address tags to snapshot tests (#11349)

Continuation of #10064 to add `server.address` tags to DB clients to
comply with OTel standards.

Update `django` snapshot files, and modify the logic to set
`server_address` using the existing internal method (for future
instrumentations).

## Checklist
- [x] PR author has checked that all the criteria below are met
- The PR description includes an overview of the change
- The PR description articulates the motivation for the change
- The change includes tests OR the PR description describes a testing
strategy
- The PR description notes risks associated with the change, if any
- Newly-added code is easy to change
- The change follows the [library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
- The change includes or references documentation updates if necessary
- Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist
- [x] Reviewer has checked that all the criteria below are met 
- Title is accurate
- All changes are related to the pull request's stated goal
- Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes
- Testing strategy adequately addresses listed risks
- Newly-added code is easy to change
- Release note makes sense to a user of the library
- If necessary, author has acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment
- Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)

ddtrace/contrib/trace_utils.py

@@ -431,6 +431,7 @@ def set_http_meta(
     method=None,  # type: Optional[str]
     url=None,  # type: Optional[str]
     target_host=None,  # type: Optional[str]
+    server_address=None,  # type: Optional[str]
     status_code=None,  # type: Optional[Union[int, str]]
     status_msg=None,  # type: Optional[str]
     query=None,  # type: Optional[str]
@@ -474,6 +475,9 @@ def set_http_meta(
     if target_host is not None:
         span.set_tag_str(net.TARGET_HOST, target_host)
 
+    if server_address is not None:
+        span.set_tag_str(net.SERVER_ADDRESS, server_address)
+
     if status_code is not None:
         try:
             int_status_code = int(status_code)

tests/snapshots/tests.contrib.django.test_django_snapshots.test_psycopg2_query_default.json

@@ -48,6 +48,7 @@
          "db.system": "postgresql",
          "db.user": "postgres",
          "out.host": "127.0.0.1",
+         "server.address": "127.0.0.1",
          "span.kind": "client"
        },
        "metrics": {

tests/snapshots/tests.contrib.django.test_django_snapshots.test_psycopg3_query_default.json

@@ -48,6 +48,7 @@
          "db.system": "postgresql",
          "db.user": "postgres",
          "out.host": "127.0.0.1",
+         "server.address": "127.0.0.1",
          "span.kind": "client"
        },
        "metrics": {