Show multi-stage engine explain plan for integration test query failures with the multi-stage query engine

[yashmayya]

• Currently if there's a query related integration test failure with the multi-stage query engine, the explain plan that is displayed to aid debugging is the single-stage query engine explain plan for the same query (which might or might not even be a valid query for the single-stage query engine).
• This minor patch fixes the issue to show the appropriate explain plan depending on the query engine being used in the integration test.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 63.79%. Comparing base (59551e4) to head (811d534). Report is 1343 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #14475 +/- ## ============================================ + Coverage 61.75% 63.79% +2.04% - Complexity 207 1565 +1358 ============================================ Files 2436 2663 +227 Lines 133233 146201 +12968 Branches 20636 22403 +1767 ============================================ + Hits 82274 93275 +11001 - Misses 44911 46030 +1119 - Partials 6048 6896 +848 ``` | [Flag](https://app.codecov.io/gh/apache/pinot/pull/14475/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | Coverage Δ | | |---|---|---| | [custom-integration1](https://app.codecov.io/gh/apache/pinot/pull/14475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `100.00% <ø> (+99.99%)` | :arrow_up: | | [integration](https://app.codecov.io/gh/apache/pinot/pull/14475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `100.00% <ø> (+99.99%)` | :arrow_up: | | [integration1](https://app.codecov.io/gh/apache/pinot/pull/14475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `100.00% <ø> (+99.99%)` | :arrow_up: | | [integration2](https://app.codecov.io/gh/apache/pinot/pull/14475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `0.00% <ø> (ø)` | | | [java-11](https://app.codecov.io/gh/apache/pinot/pull/14475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `63.76% <ø> (+2.05%)` | :arrow_up: | | [java-21](https://app.codecov.io/gh/apache/pinot/pull/14475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `63.69% <ø> (+2.06%)` | :arrow_up: | | [skip-bytebuffers-false](https://app.codecov.io/gh/apache/pinot/pull/14475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `63.79% <ø> (+2.04%)` | :arrow_up: | | [skip-bytebuffers-true](https://app.codecov.io/gh/apache/pinot/pull/14475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `63.65% <ø> (+35.92%)` | :arrow_up: | | [temurin](https://app.codecov.io/gh/apache/pinot/pull/14475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `63.79% <ø> (+2.04%)` | :arrow_up: | | [unittests](https://app.codecov.io/gh/apache/pinot/pull/14475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `63.79% <ø> (+2.04%)` | :arrow_up: | | [unittests1](https://app.codecov.io/gh/apache/pinot/pull/14475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `55.58% <ø> (+8.69%)` | :arrow_up: | | [unittests2](https://app.codecov.io/gh/apache/pinot/pull/14475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `34.11% <ø> (+6.38%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache#carryforward-flags-in-the-pull-request-comment) to find out more.

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