[BugFix] Fix the bug that the backend of other clusters is added to the current cluster when synchronizing Olap external table metadata

[gengjun-git]

Why I'm doing:

PR #40982 remove the systemInfoMap from NodeMgr, so all the backends are added into the current cluster.

What I'm doing:

Store the external SystemInfoService into Olap External Table, and use it when loading into that table.

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
  • 3.3
  • 3.2
  • 3.1
  • 3.0
  • 2.5

[sonarcloud]

Quality Gate passed

Issues
3 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 SonarCloud

[github-actions]

[FE Incremental Coverage Report]

✅ pass : 31 / 33 (93.94%)

file detail

	path	covered_line	new_line	coverage	not_covered_line_detail
🔵	com/starrocks/planner/OlapTableSink.java	6	7	85.71%	[738]
🔵	com/starrocks/catalog/ExternalOlapTable.java	13	14	92.86%	[290]
🔵	com/starrocks/service/FrontendServiceImpl.java	10	10	100.00%	[]
🔵	com/starrocks/planner/SchemaTableSink.java	2	2	100.00%	[]

[github-actions]

[BE Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

@Mergifyio backport branch-3.3

[mergify]

backport branch-3.3

✅ Backports have been created

• #49468 [BugFix] Fix the bug that the backend of other clusters is added to the current cluster when synchronizing Olap external table metadata (backport #49323) has been created for branch branch-3.3