Add option `ciGroupName` to the `@nx/jest/plugin` to allow customizing
the `Jest` atomized taks group on CI.
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## Current Behavior
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When using Atomizer on Jest for **unit tests** (via the `"ciTargetName":
"test-ci"`), the atomized tasks will be grouped under the misleading
name **"E2E (CI)"**.
Worst, if Atomizer is enabled for both **unit** and **e2e** tests, it
will result on E2E atomized tasks being overwritten by the one from unit
tests... when run on Nx Cloud.
## Expected Behavior
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Allow customizing the name of the atomized tasks group. The group name
can be derived from the `ciTargetName` , when not explicitly provided.
## Related Issue(s)
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merged. -->
Fixes#28066
Co-authored-by: Leosvel Pérez Espinosa <leosvel.perez.espinosa@gmail.com>