[Enhancement] Add [[nodiscard]] to functions

[satanson]

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

Bugfix cherry-pick branch check:

• I have checked the version labels which the pr will be auto-backported to the target branch
  • 3.2
  • 3.1
  • 3.0
  • 2.5

[silverbullet233]

fixed #27471

[wanpengfei-git]

[FE Incremental Coverage Report]

😍 pass : 0 / 0 (0%)

[wanpengfei-git]

[BE Incremental Coverage Report]

😞 fail : 3 / 37 (08.11%)

file detail

	path	covered_line	new_line	coverage	not_covered_line_detail
🔵	src/exec/hash_joiner.cpp	0	4	00.00%	[245, 247, 340, 549]
🔵	src/exec/pipeline/hashjoin/spillable_hash_join_probe_operator.cpp	0	2	00.00%	[228, 338]
🔵	src/exec/hash_join_components.cpp	0	4	00.00%	[22, 26, 27, 82]
🔵	src/exec/hash_join_node.cpp	0	2	00.00%	[561, 892]
🔵	src/exec/hash_joiner.h	0	9	00.00%	[263, 265, 266, 269, 271, 272, 280, 297, 314]
🔵	src/exec/query_cache/cache_operator.cpp	0	2	00.00%	[525, 527]
🔵	src/exec/pipeline/hashjoin/hash_join_probe_operator.cpp	0	2	00.00%	[78, 122]
🔵	src/exec/join_hash_map.cpp	0	1	00.00%	[461]
🔵	src/exec/pipeline/runtime_filter_types.h	1	9	11.11%	[223, 224, 229, 252, 310, 389, 397, 398]
🔵	src/exec/query_cache/cache_manager.cpp	2	2	100.00%	[]