fix: strip unresolved keyword placeholders from API payloads before deploy

[ankita10119]

🔧 Changes

When a keyword placeholder (e.g. ##MY_SECRET##) is not resolved, because the corresponding environment variable is absent or the keyword file is missing, the raw ##...## string was previously forwarded to the Auth0 Management API, silently overwriting real tenant values with literal placeholder strings.

New utility: stripUnresolvedPlaceholders (src/tools/utils.ts)

• Recursively scans an asset object and removes any string field whose value matches the ##...## pattern.
• Emits a log.warn for each stripped field, including the full dotted field path, resource type, resource name, and the offending placeholder value, so operators have a clear audit trail.

src/tools/auth0/handlers/default.ts

• stripUnresolvedPlaceholders is now applied in all three create/update payload construction paths, chained after stripObfuscatedFieldsFromPayload.
• Fields with unresolved placeholders are dropped from the payload; the existing tenant value is preserved rather than overwritten.

📚 References

closes #1344

🔬 Testing

Unit tests covering:

• A field containing ##PLACEHOLDER## is stripped and a warning is logged.
• A nested field (e.g. options.secret) containing an unresolved placeholder is stripped with the correct dotted path in the warning.
• Fields with resolved values pass through unchanged.
• null inputs and array values are returned as-is without modification.
• Both create and update code paths strip unresolved placeholders before the API call is made.

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.14%. Comparing base (8fe0e28) to head (5188d81).

Files with missing lines	Patch %	Lines
src/tools/auth0/handlers/default.ts	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1360      +/-   ##
==========================================
+ Coverage   80.10%   80.14%   +0.03%     
==========================================
  Files         152      152              
  Lines        6212     6229      +17     
  Branches     1290     1295       +5     
==========================================
+ Hits         4976     4992      +16     
- Misses        702      703       +1     
  Partials      534      534              

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