[Refactor] Add ExecEnv guardrails and context scaffolding

[alvin-celerdata]

Why I'm doing:

What I'm doing:

Fixes #issue

What type of PR is this:

• BugFix
• Feature
• Enhancement
• Refactor
• UT
• Doc
• Tool

Does this PR entail a change in behavior?

• Yes, this PR will result in a change in behavior.
• No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• Interface/UI changes: syntax, type conversion, expression evaluation, display information
• Parameter changes: default values, similar parameters but with different default values
• Policy changes: use new policy to replace old one, functionality automatically enabled
• Feature removed
• Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function
  • This pr needs auto generate documentation
• This is a backport pr

Bugfix cherry-pick branch check:

• I have checked the version labels which the pr will be auto-backported to the target branch
  • 4.1
  • 4.0
  • 3.5
  • 3.4

[CelerData-Reviewer]

@codex review

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Defer context refresh until members are initialized

Calling _refresh_service_contexts() in the default constructor copies member pointers into the service views before init() assigns them, but ExecEnv still has raw-pointer fields without in-class initialization (notably _lookup_dispatcher_mgr and _cache_mgr in exec_env.h). For non-static ExecEnv instances (including this test pattern), those fields are indeterminate, so this constructor path performs undefined reads and can propagate garbage pointers into runtime_services().

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[github-actions]

[FE Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

[BE Incremental Coverage Report]

✅ pass : 78 / 78 (100.00%)

file detail

	path	covered_line	new_line	coverage	not_covered_line_detail
🔵	be/src/runtime/exec_env.cpp	71	71	100.00%	[]
🔵	be/src/runtime/service_contexts.h	7	7	100.00%	[]