bplapply() et al. returns RngFutureError:s rather than signals them

```r
library(BiocParallel.FutureParam)
register(FutureParam())
options(future.rng.onMisuse = "error")
y <- bplapply(1:2, rnorm)
```

```r
> str(y)
List of 2
$ :List of 2
..$ message: chr "UNRELIABLE VALUE: Future ('') unexpectedly generated random numbers without specifying argument 'seed'. T"| __truncated__
..$ call : NULL
..- attr(*, "class")= chr [1:6] "RngFutureError" "FutureError" "error" "RngFutureCondition" ...
..- attr(*, "future")=Classes 'SequentialFuture', 'UniprocessFuture', 'Future', 'environment'
$ :List of 2
..$ message: chr "UNRELIABLE VALUE: Future ('') unexpectedly generated random numbers without specifying argument 'seed'. T"| __truncated__
..$ call : NULL
..- attr(*, "class")= chr [1:6] "RngFutureError" "FutureError" "error" "RngFutureCondition" ...
..- attr(*, "future")=Classes 'SequentialFuture', 'UniprocessFuture', 'Future', 'environment'
```

The expected behavior should be:

```r
y <- bplapply(1:2, rnorm)
Error: UNRELIABLE VALUE: Future ('') unexpectedly generated random numbers without specifying argument 'seed'. There is a risk that those random numbers are not statistically sound and the overall results might be invalid. To fix this, specify 'seed=TRUE'. This ensures that proper, parallel-safe random numbers are produced via the L'Ecuyer-CMRG method. To disable this check, use 'seed=NULL', or set option 'future.rng.onMisuse' to "ignore".
```

Similarly, with RngFutureWarning:s, we would expect:

```r
library(BiocParallel.FutureParam)
register(FutureParam())
options(future.rng.onMisuse = "warning") # default
y <- bplapply(1:2, rnorm)
Warning: UNRELIABLE VALUE: Future ('') unexpectedly generated random numbers without specifying argument 'seed'. There is a risk that those random numbers are not statistically sound and the overall results might be invalid. To fix this, specify 'seed=TRUE'. This ensures that proper, parallel-safe random numbers are produced via the L'Ecuyer-CMRG method. To disable this check, use 'seed=NULL', or set option 'future.rng.onMisuse' to "ignore".
```

but right now those warnings are muffled and never signaled.

Beginne damit, das Beispiel mit bplapply(), FutureParam() und future.rng.onMisuse auf "error" oder "warning" reproduzierbar nachzustellen. Verfolge, wie RngFutureError und RngFutureWarning behandelt werden, und überprüfe anschließend, dass Fehler signalisiert, Warnungen ausgegeben und die bestehenden erwarteten Meldungen beibehalten werden.

Vom Indexierungsmodell aus dem Issue-Text verfasst.