[fix](function)fix get_json_string does not support array

[dtkavin]

What problem does this PR solve?

Problem Summary:

branch-2.1

In the official documentation, the following SQL statements have return values，but it is currently returning null

mysql> SELECT get_json_string('[{"k1":"v1"}, {"k2":"v2"}, {"k1":"v3"}, {"k1":"v4"}]', '$.k1');
+---------------------------------------------------------------------------------+
| get_json_string('[{"k1":"v1"}, {"k2":"v2"}, {"k1":"v3"}, {"k1":"v4"}]', '$.k1') |
+---------------------------------------------------------------------------------+
| ["v1","v3","v4"]                                                                |
+---------------------------------------------------------------------------------+

Related PR: #56059

Problem Summary:

Release note

None

Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
    • This is a refactor/code format and no logic has been changed.
    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

[Thearas]

Thank you for your contribution to Apache Doris.
Don't know what should be done next? See How to process your PR.

Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[dtkavin]

run buildall

[doris-robot]

BE UT Coverage Report

Increment line coverage 68.57% (24/35) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	39.15% (10402/26568)
Line Coverage	30.13% (86281/286317)
Region Coverage	27.69% (49830/179964)
Branch Coverage	24.25% (24454/100846)

[dtkavin]

run buildall

[doris-robot]

BE UT Coverage Report

Increment line coverage 68.57% (24/35) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	39.14% (10400/26568)
Line Coverage	30.14% (86289/286317)
Region Coverage	27.68% (49821/179964)
Branch Coverage	24.24% (24447/100846)