Vole test files have problems when the package is loaded with `OnlyNeeded`

[wilfwilson]

 ┌───────┐   GAP 4.16dev-2-gd021536 built on 2025-09-05 14:08:36+0100
 │  GAP  │   https://www.gap-system.org
 └───────┘   Architecture: x86_64-apple-darwin24-default64-kv10
 Configuration:  gmp 6.3.0, GASMAN, readline
 Loading the library and packages ...
 Packages:   GAPDoc 1.6.7.dev, PrimGrp 4.0.0, SmallGrp 1.5.4, TransGrp 3.6.5

 Try '??help' for help. See also '?copyright', '?cite' and '?authors'
gap> LoadPackage("Vole", false : OnlyNeeded);;
gap> Read("tst/testall.g");
Architecture: x86_64-apple-darwin24-default64-kv10

testing: /Users/Wilf/gap/pkg/vole/tst/basic.tst
########> Diff in /Users/Wilf/gap/pkg/vole/tst/basic.tst:7
# Input is:
ReadPackage("vole", "tst/test_functions.g");
# Expected output:
true
# But found:
Error, BIND_GLOBAL: variable `IsConstraint' must be unbound
Error, was not in any namespace
Error, was not in any namespace
Error, was not in any namespace
########
########> Diff in /Users/Wilf/gap/pkg/vole/tst/basic.tst:15
# Input is:
VoleComp(5, [Constraint.Stabilize([2,3,4], OnSets), Constraint.Stabilize([3,4,\
5], OnSets)]);
# Expected output:
# But found:
Syntax warning: Unbound global variable in stream:1
VoleComp(5, [Constraint.Stabilize([2,3,4], OnSets), Constraint.Stabilize([3,4,\
\
5], OnSets)]);
^^^^^^^^
Error, Variable: 'VoleComp' must have a value
########
########> Diff in /Users/Wilf/gap/pkg/vole/tst/basic.tst:16
# Input is:
VoleComp(7, [Constraint.Stabilize([2,3,4], OnSets), Constraint.Stabilize([5], \
OnTuples)]);
# Expected output:
# But found:
Syntax warning: Unbound global variable in stream:1
VoleComp(7, [Constraint.Stabilize([2,3,4], OnSets), Constraint.Stabilize([5], \
\
OnTuples)]);
^^^^^^^^
Error, Variable: 'VoleComp' must have a value
########

...and so on.

[wilfwilson]

Once this is resolved we can add an only needed job to the CI using the mode: 'onlyneeded' input to gap-actions/run-pkg-tests@v4.