Unify flow execution error

[NutharaNR]

Purpose

Approach

Related Issues

• Unify flow execution error structure and add i18n support #2064

Related PRs

• N/A

Checklist

• Followed the contribution guidelines.
• Manual test round performed and verified.
• Documentation provided. (Add links if there are any)
  • Ran Vale and fixed all errors and warnings
• Tests provided. (Add links if there are any)
  • Unit Tests
  • Integration Tests
• Breaking changes. (Fill if applicable)
  • Breaking changes section filled.
  • breaking change label added.

Security checks

• Followed secure coding standards in WSO2 Secure Coding Guidelines
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets.

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[codecov]

Codecov Report

❌ Patch coverage is 79.50530% with 58 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
backend/internal/flow/flowexec/engine.go	50.00%	14 Missing and 1 partial ⚠️
...end/internal/flow/executor/identifying_executor.go	54.54%	10 Missing ⚠️
backend/internal/flow/executor/error_constants.go	30.76%	9 Missing ⚠️
backend/internal/flow/executor/oauth_executor.go	76.47%	4 Missing ⚠️
...kend/internal/flow/executor/magic_link_executor.go	81.25%	3 Missing ⚠️
...ackend/internal/flow/executor/sms_auth_executor.go	85.71%	3 Missing ⚠️
backend/internal/flow/flowexec/service.go	0.00%	3 Missing ⚠️
backend/internal/flow/core/prompt_node.go	81.81%	2 Missing ⚠️
...kend/internal/flow/executor/basic_auth_executor.go	75.00%	2 Missing ⚠️
...ackend/internal/flow/executor/credential_setter.go	83.33%	1 Missing ⚠️
... and 6 more

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