ci: make configuration generation script fail on error [backport 1.18] (#6866)

Backport 50c2a0f from #6833 to 1.18.

## Checklist

- [x] Change(s) are motivated and described in the PR description.
- [x] Testing strategy is described if automated tests are not included
in the PR.
- [x] Risk is outlined (performance impact, potential for breakage,
maintainability, etc).
- [x] Change is maintainable (easy to change, telemetry, documentation).
- [x] [Library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
are followed. If no release note is required, add label
`changelog/no-changelog`.
- [x] Documentation is included (in-code, generated user docs, [public
corp docs](https://github.com/DataDog/documentation/)).
- [x] Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist

- [x] Title is accurate.
- [x] No unnecessary changes are introduced.
- [x] Description motivates each change.
- [x] Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes unless absolutely necessary.
- [x] Testing strategy adequately addresses listed risk(s).
- [x] Change is maintainable (easy to change, telemetry, documentation).
- [x] Release note makes sense to a user of the library.
- [x] Reviewer has explicitly acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment.
- [x] Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)
- [x] If this PR touches code that signs or publishes builds or
packages, or handles credentials of any kind, I've requested a review
from `@DataDog/security-design-and-guidance`.
- [x] This PR doesn't touch any of that.

Co-authored-by: Gabriele N. Tornetta <[email protected]>
Co-authored-by: Zachary Groves <[email protected]>

Author: 3 people

scripts/gen_circleci_config.py

@@ -145,6 +145,7 @@ def gen_c_check(template: dict) -> None:
     LOGGER.info("Loading configuration template from %s", CONFIG_TEMPLATE_FILE)
     config = yaml.load(CONFIG_TEMPLATE_FILE)
 
+    has_error = False
     LOGGER.info("Configuration generation steps:")
     for name, func in dict(globals()).items():
         if name.startswith("gen_"):
@@ -155,7 +156,10 @@ def gen_c_check(template: dict) -> None:
                 end = time()
                 LOGGER.info("- %s: %s [took %dms]", name, desc, int((end - start) / 1e6))
             except Exception as e:
-                LOGGER.error("- %s: %s [reason: %s]", name, desc, str(e))
+                LOGGER.error("- %s: %s [reason: %s]", name, desc, str(e), exc_info=True)
+                has_error = True
 
     LOGGER.info("Writing generated configuration to %s", CONFIG_GEN_FILE)
     yaml.dump(config)
+
+    sys.exit(has_error)