refactor: direct constants import (#12973)

We refactor some imports from ddtrace.constants to import the module
directly instead of grabbing it from ddtrace. This removes some circular
import paths from static code analysis.

## Checklist
- [x] PR author has checked that all the criteria below are met
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- The PR description articulates the motivation for the change
- The change includes tests OR the PR description describes a testing
strategy
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- Newly-added code is easy to change
- The change follows the [library release note
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- The change includes or references documentation updates if necessary
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[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
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[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes
- Testing strategy adequately addresses listed risks
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implications of this PR as reported in the benchmarks PR comment
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[release branch maintenance
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Author: P403n1x87

Diff for: ddtrace/appsec/_api_security/api_manager.py

@@ -5,10 +5,10 @@
 import time
 from typing import Optional
 
-from ddtrace import constants
 from ddtrace._trace._limits import MAX_SPAN_META_VALUE_LEN
 from ddtrace.appsec._constants import API_SECURITY
 from ddtrace.appsec._constants import SPAN_DATA_NAMES
+import ddtrace.constants as constants
 from ddtrace.internal.logger import get_logger
 from ddtrace.internal.service import Service
 from ddtrace.settings.asm import config as asm_config

Diff for: ddtrace/appsec/_trace_utils.py

@@ -1,6 +1,5 @@
 from typing import Optional
 
-from ddtrace import constants
 from ddtrace.appsec import _asm_request_context
 from ddtrace.appsec._asm_request_context import call_waf_callback
 from ddtrace.appsec._asm_request_context import get_blocked
@@ -9,6 +8,7 @@
 from ddtrace.appsec._constants import LOGIN_EVENTS_MODE
 from ddtrace.appsec._constants import WAF_ACTIONS
 from ddtrace.appsec._utils import _hash_user_id
+import ddtrace.constants as constants
 from ddtrace.contrib.internal.trace_utils import set_user
 from ddtrace.ext import SpanTypes
 from ddtrace.ext import user