fix(test): update the config for neon_binpath in from_repo_dir

[skyzh]

Problem

#7637 breaks forward compat test.

On commit ea531d4.

https://neon-github-public-dev.s3.amazonaws.com/reports/main/8988324349/index.html

test_create_snapshot
2024-05-07T16:03:11.331883Z  INFO version: git-env:ea531d448eb65c4f58abb9ef7d8cd461952f7c5f failpoints: true, features: ["testing"] launch_timestamp: 2024-05-07 16:03:11.316131763 UTC build_tag: build_tag-env:5159

test_forward_compatibility
2024-05-07T16:07:02.310769Z  INFO version: git-env:ea531d448eb65c4f58abb9ef7d8cd461952f7c5f failpoints: true, features: ["testing"] launch_timestamp: 2024-05-07 16:07:02.294676183 UTC build_tag: build_tag-env:5159

The forward compatibility test is actually using the same tag as the current build.

The commit before that,

https://neon-github-public-dev.s3.amazonaws.com/reports/main/8988126011/index.html

test_create_snapshot
2024-05-07T15:47:21.900796Z  INFO version: git-env:2dbd1c1ed5cd0458933e8ffd40a9c0a5f4d610b8 failpoints: true, features: ["testing"] launch_timestamp: 2024-05-07 15:47:21.882784185 UTC build_tag: build_tag-env:5158

test_forward_compatibility
2024-05-07T15:50:48.828733Z  INFO version: git-env:c4d7d5982553d2cf66634d1fbf85d95ef44a6524 failpoints: true, features: ["testing"] launch_timestamp: 2024-05-07 15:50:48.816635176 UTC build_tag: build_tag-env:release-5434

This pull request patches the bin path so that the new neon_local will use the old binary

Summary of changes

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• Do we need to implement analytics? if so did you add the relevant metrics to the dashboard?
• If this PR requires public announcement, mark it with /release-notes label and add several sentences in this section.

Checklist before merging

• Do not forget to reformat commit message to not include the above checklist

[github-actions]

3024 tests run: 2892 passed, 0 failed, 132 skipped (full report)

---

Code coverage* (full report)

• functions: 31.4% (6320 of 20132 functions)
• lines: 47.3% (47622 of 100707 lines)

* collected from Rust tests only

---

_{The comment gets automatically updated with the latest test results
f8b3478 at 2024-05-09T19:01:10.123Z :recycle:}

[skyzh]

manually checked the log:

in forward compatibility test: 2024-05-09T18:38:54.243059Z INFO version: git-env:c4d7d5982553d2cf66634d1fbf85d95ef44a6524 failpoints: true, features: ["testing"] launch_timestamp: 2024-05-09 18:38:54.231427251 UTC build_tag: build_tag-env:release-5434

in test create snapshot: 2024-05-09T18:35:04.268540Z INFO version: git-env:f8b347821c1e5b22061771a880c236b42958b6e9 failpoints: true, features: ["testing"] launch_timestamp: 2024-05-09 18:35:04.255529183 UTC build_tag: build_tag-env:9021646963

auto check version will be part of #7685