[BugFix] fix partial update column name sensitive issue (backport #55430)

[mergify]

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

[mergify]

Cherry-pick of ab228aa has failed:

On branch mergify/bp/branch-3.4/pr-55430
Your branch is up to date with 'origin/branch-3.4'.

You are currently cherry-picking commit ab228aaac.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	new file:   test/common/data/stream_load/test_partial_update_case_sensitive.csv
	new file:   test/sql/test_stream_load/R/test_partial_update_case_sensitive
	new file:   test/sql/test_stream_load/T/test_partial_update_case_sensitive

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   fe/fe-core/src/main/java/com/starrocks/load/Load.java

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[mergify]

@mergify[bot]: Backport conflict, please reslove the conflict and resubmit the pr

[sonarqubecloud]

Quality Gate passed

Issues
0 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