[BugFix] Routine load name with backquotes

[rickif]

What type of PR is this：

• [x] BugFix
• [ ] Feature
• [ ] Enhancement
• [ ] Refactor
• [ ] UT
• [ ] Doc
• [ ] Tool

Which issues of this PR fixes ：

Fixes https://github.com/StarRocks/starrocks/issues/11550

Problem Summary(Required) ：

The new parser cannot handle the identifiers with backquotes. This PR is to fix the problem and keep compatible with old versions.

Checklist:

• [x] I have added test cases for my bug fix or my new feature
• [ ] I have added user document for my new feature or new function

[rickif]

@mergifyio backport branch-2.4

[mergify[bot]]

backport branch-2.4

✅ Backports have been created

• #11815 [BugFix] Routine load name with backquotes (backport #11552) has been created for branch branch-2.4

[sonarqubecloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication

[rickif]

run starrocks_fe_unittest

[wanpengfei-git]

[FE PR Coverage Check]

:disappointed: fail : 8 / 11 (72.73%)

file detail

	path	covered_line	new_line	coverage	not_covered_line_detail
:large_blue_circle:	com/starrocks/analysis/ShowRoutineLoadTaskStmt.java	1	2	50.00%	[91]
:large_blue_circle:	com/starrocks/sql/parser/AstBuilder.java	7	9	77.78%	[1809, 1813]

[wanpengfei-git]

run starrocks_admit_test