[ci] Make Clang Errors Fail Build
[ci] Make Clang Errors Fail Build

This commit removes `continueOnError: true` from the clang software
build and test tasks. Now if either of these tasks fail, then the whole
build will fail.

Signed-off-by: Sam Elliott <32a4841301e2f444934d6e427a2764482fa7a43d@lowrisc.org>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan