[BugFix] Fix spill merge options in various key type/order by/merge condition configs

[decster]

Why I'm doing:

What I'm doing:

• spill merge cannot be applied when having merge conditions, so disable it if merge_condition is not empty
• aggregate/unique key table can do aggregation when do merge, so enable it
• duplicate key do not need aggregation
• primary key may do/not do aggregation in normal cases, but when order key is different from primary key, should not do aggregation, so just don't do aggregation.

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 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
  • 3.4
  • 3.3
  • 3.2
  • 3.1
  • 3.0

[github-actions]

[Java-Extensions Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

[FE Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

[BE Incremental Coverage Report]

✅ pass : 4 / 4 (100.00%)

file detail

	path	covered_line	new_line	coverage	not_covered_line_detail
🔵	be/src/storage/lake/spill_mem_table_sink.cpp	3	3	100.00%	[]
🔵	be/src/storage/lake/delta_writer.cpp	1	1	100.00%	[]