feat: add login-post-identifier and signup-post-identifier action triggers

[ankita10119]

🔧 Changes

Add login-post-identifier and signup-post-identifier to the list of supported action triggers.

• Added both triggers to ACTIONS_TRIGGERS in src/tools/constants.ts
• Updated example configs (examples/directory/triggers/triggers.json, examples/yaml/tenant.yaml)

📚 References

• Auth0 Terraform Provider: auth0/terraform-provider-auth0#1605

🔬 Testing

• Existing trigger tests cover the new entries via the ACTIONS_TRIGGERS constant
• Manual: deploy a tenant config containing login-post-identifier or signup-post-identifier trigger bindings

📝 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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.19%. Comparing base (fedb588) to head (3e8b142).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1409   +/-   ##
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  Coverage   80.19%   80.19%           
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  Files         153      153           
  Lines        7119     7119           
  Branches     1573     1573           
=======================================
  Hits         5709     5709           
  Misses        760      760           
  Partials      650      650           

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[harshithRai]

LGTM