[BugFix] fix partial update column name sensitive issue

[luohaha]

Why I'm doing:

Fix partial update column name sensitive issue.

E.g:
table:

CREATE TABLE `test` (
  `id` bigint(20) NOT NULL COMMENT "",
  `name` varchar(16) NULL DEFAULT "" COMMENT "",
  `city` varchar(16) NULL DEFAULT "" COMMENT "",
  `age` varchar(24) NULL DEFAULT "" COMMENT ""
) ENGINE=OLAP
PRIMARY KEY(`id`)
DISTRIBUTED BY HASH(`id`) BUCKETS 1
PROPERTIES (
"replication_num" = "1"
); 

partial update:

curl --location-trusted -u root: -T tt.csv -XPUT -H label:stream_load_1 -H "partial_update:true" -H "columns:ID,name" -H "timeout:86400" -H "max_filter_ratio:0.1" http://172.26.80.4:8030/api/testdb/test2/_stream_load

Use columns:ID,name instead of columns:id,name. It will lead to:

"Message": "key column id not in partial update columns",

What I'm doing:

Fix it

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

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

[Java-Extensions Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

[FE Incremental Coverage Report]

✅ pass : 3 / 3 (100.00%)

file detail

	path	covered_line	new_line	coverage	not_covered_line_detail
🔵	com/starrocks/load/Load.java	3	3	100.00%	[]

[github-actions]

[BE Incremental Coverage Report]

✅ pass : 0 / 0 (0%)