fix: for muliple pipelines report failure to load

[mcwarman]

Fix #1720

• Update LoadConfigurations to add error report
• Add LoadCongifurations tests

Test

To test this pull request, you can run the following commands:

cd  pkg/core/engine/
go test

Additional Information

Was done slightly differently that suggested in #1720 as e.Reports was available appended rather than charging the return.

[mcwarman]

./bin/updatecli diff

+++++++++++
+ PREPARE +
+++++++++++

Loading Pipeline "updatecli.d/pre-commit-megalinter.yaml"
WARNING: Updatecli binary version is unset. This means you are using a development version that ignores manifest version constraint.
Loading Pipeline "updatecli.d/updatecli.yaml"
ERROR: failed loading pipeline(s)
        * "updatecli.d/updatecli.yaml" - scm id "default1" doesn't exist
// ...
REPORTS:



✗ :

        Error: "updatecli.d/updatecli.yaml" - scm id "default1" doesn't exist

✔ pre-commit MegaLinter:
        Source:
                ✔ [latestRelease] Get latest pre-commit MegaLinter release
        Condition:
                ✔ [ensurePreCommitOrder] Ensure pre-commit repo order
        Target:
                ✔ [preCommitConfig] Update MegaLinter pre-commit  to v7.4.0

Run Summary
===========
Pipeline(s) run:
  * Changed:    0
  * Failed:     1
  * Skipped:    0
  * Succeeded:  1
  * Total:      2
ERROR: ✗ 1 over 2 pipeline failed
ERROR: command failed: 1 over 2 pipeline failed

❯ echo $?
1

[olblak]

Thanks for the pull request
I just did some testing and it works great.