Remove unnecessary status messages when detecting MPI continuations support

[msimberg]

We already print:

-- Performing Test PIKA_WITH_MPIX_CONTINUATIONS - Failed

when performing the feature test itself. I propose to remove the trailing:

-- MPIx Continuations not detected

since:

• it says the same as the previous line (admittedly a bit nicer, but still)
• we only print the Performing Test PIKA_WITH... line for all other feature checks

[codacy-production[bot]]

Coverage summary from Codacy

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Coverage variation	Diff coverage
:white_check_mark: +0.02% (target: -1.00%)	:white_check_mark: ∅ (target: 90.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (d7662804beb15f33d834b83c49832fd37b5d08cc) | 18346 | 13763 | 75.02% | | | Head commit (73f090ee1a6379664c256d942283912b4d0853af) | 18346 (+0) | 13767 (+4) | 75.04% (**+0.02%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#1250) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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