easyblocks unit tests

update `PythonPackage` easyblock to allow installation of Python packages with `$PIP_REQUIRE_VIRTUALENV` set + move temporary pip folder into build dir #4631

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Run time

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Job	Run time
build (3.6, Lmod-6.6.3, Lua)	1m 29s
build (3.6, Lmod-6.6.3, Tcl)	1m 24s
build (3.6, Lmod-7.8.22, Lua)	1m 33s
build (3.6, Lmod-7.8.22, Tcl)	1m 34s
build (3.6, Lmod-8.1.14, Lua)	1m 56s
build (3.6, Lmod-8.1.14, Tcl)	1m 30s
build (3.6, modules-tcl-1.147, Tcl)	58s
build (3.6, modules-3.2.10, Tcl)	1m 5s
build (3.6, modules-4.1.4, Tcl)	1m 12s
build (3.7, Lmod-6.6.3, Lua)	1m 22s
build (3.7, Lmod-6.6.3, Tcl)	1m 24s
build (3.7, Lmod-7.8.22, Lua)	1m 34s
build (3.7, Lmod-7.8.22, Tcl)	1m 33s
build (3.7, Lmod-8.1.14, Lua)	1m 50s
build (3.7, Lmod-8.1.14, Tcl)	1m 32s
build (3.8, Lmod-6.6.3, Lua)	1m 19s
build (3.8, Lmod-6.6.3, Tcl)	1m 23s
build (3.8, Lmod-7.8.22, Lua)	1m 34s
build (3.8, Lmod-7.8.22, Tcl)	1m 27s
build (3.8, Lmod-8.1.14, Lua)	1m 25s
build (3.8, Lmod-8.1.14, Tcl)	1m 24s
build (3.9, Lmod-6.6.3, Lua)	1m 25s
build (3.9, Lmod-6.6.3, Tcl)	1m 23s
build (3.9, Lmod-7.8.22, Lua)	1m 39s
build (3.9, Lmod-7.8.22, Tcl)	1m 35s
build (3.9, Lmod-8.1.14, Lua)	1m 30s
build (3.9, Lmod-8.1.14, Tcl)	1m 32s
build (3.10, Lmod-6.6.3, Lua)	1m 50s
build (3.10, Lmod-6.6.3, Tcl)	1m 44s
build (3.10, Lmod-7.8.22, Lua)	1m 48s
build (3.10, Lmod-7.8.22, Tcl)	1m 56s
build (3.10, Lmod-8.1.14, Lua)	1m 48s
build (3.10, Lmod-8.1.14, Tcl)	1m 55s
build (3.11, Lmod-6.6.3, Lua)	2m 1s
build (3.11, Lmod-6.6.3, Tcl)	2m 5s
build (3.11, Lmod-7.8.22, Lua)	1m 56s
build (3.11, Lmod-7.8.22, Tcl)	1m 58s
build (3.11, Lmod-8.1.14, Lua)	2m 3s
build (3.11, Lmod-8.1.14, Tcl)	2m 3s
	1h 2m 39s