mesa: change dsa texture error codes for GL 4.6

mesa: change dsa texture error codes for GL 4.6

GL 4.6 changed error code for when the effective target of the
texture is illegal. Since it's not an illegal enum they modified
it to be an illegal operation.

However the CTS test for this is missing support for two cases,
I'm chasing that up, but I expect this will cause a CTS regression
for anyone who runs this test. I'm leaning on the side of being
compliant rather than passing the test until the test is fixed.

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5896>