[rename](nlj) Unify naming: rename left to probe.

[Mryange]

What problem does this PR solve?

    int _left_block_start_pos = 0;
    int _left_block_pos; // current scan pos in _left_block
    int _left_side_process_count = 0;

    int _probe_block_start_pos = 0;
    int _probe_block_pos; // current scan pos in _probe_block
    int _probe_side_process_count = 0;

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

[Mryange]

run buildall

[hello-stephen]

BE UT Coverage Report

Increment line coverage 0.00% (0/33) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	53.37% (18951/35508)
Line Coverage	39.25% (175862/448062)
Region Coverage	33.79% (135994/402428)
Branch Coverage	34.74% (58758/169138)

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.

[hello-stephen]

BE Regression && UT Coverage Report

Increment line coverage 93.94% (31/33) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	72.17% (25054/34713)
Line Coverage	58.94% (263368/446870)
Region Coverage	53.88% (219069/406591)
Branch Coverage	55.39% (93992/169700)