component/golang: clear user cache after build

While running tests using all.bash, `$HOME/.cache/go-build/` is
populated with data referencing the build folder. This is problematic
when using shared parts and installing a not pinned software release
multiple times, like it is the case on test node.

A scenario like this can happen:

 - a first succesful build install in `<shared>/golang1.21/<HASH1>`
 - golang1.21 section is changed in a the software release
 - golang1.21 is installed in `<shared>/golang1.21/<HASH2>`, running
   test fails because the cache `<software_folder>/.cache/go-build/` in
   references paths from `<shared>/golang1.21/<HASH1>/.build/go/src`,
   that was used when building the first build and have been removed
   while installing.

This is visible with errors like this:

    2024-03-21 20:52:37,214 INFO     slapgrid_sr: 2024-03-21 20:52:37 slapos[23849] INFO vet: can't parse raw cgo file: open ../../../../a984f246a1b2789081965ab5c05674a8/.build/go/src/net/cgo_linux.go: no such file or directory
24 jobs for fix/golang-vet-cgo-no-found in 0 seconds
Status Job ID Name Coverage
  External
failed ERP5.UnitTest-TestRunner1

06:48:14

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

11:02:26

failed ERP5.UnitTest-TestRunner1

00:26:02

failed ERP5.UnitTest-TestRunner1

01:05:13

failed ERP5.UnitTest-TestRunner1

01:25:12

failed ERP5.UnitTest-TestRunner1

01:11:37

failed ERP5.UnitTest-TestRunner1

04:04:41

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

09:07:50

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

09:10:15

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

09:27:08

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

07:46:46

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

07:40:33

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

10:08:54

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

08:58:52

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

10:36:46

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

08:51:27

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

08:23:04

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

08:35:15

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

06:23:12

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

10:30:03

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

10:00:11

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

08:33:29

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

09:09:17

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

06:42:18