SYCL - changes to match CUDA,HIP backends

sycl: Minor typo fixes

sycl - use switch for enums

minor - reduce LCOV_EXCL markers

sycl - fallback to ref from gen for non-tensor bases

Merge pull request #1488 from CEED/jeremy/const-path

Const for CeedQFunctionGetSourcePath

ci - add basic SYCL build job

internal - more updates for const

sycl: resolve const variance

minor - tidy LoadSourceToBuffer internals

internal - consistent variable name style

internal: const for source paths

Add const to CeedQFunctionLoadSourceToBuffer output argument. If we
had Result, this would look like

let const source_buffer = CeedQFunctionLoadSourceToBuffer()?;

internal: const for source paths

Add const to CeedQFunctionLoadSourceToBuffer output argument. If we
had Result, this would look like

let const source_buffer = CeedQFunctionLoadSourceToBuffer()?;

The caller is free to cast in the const when passing the output variable
if they want this semantic:

let mut source_buffer = CeedQFunctionLoadSourceToBuffer()?;

show more ...

internal - const for CeedQFunctionGetSourcePath

Merge pull request #1487 from CEED/jeremy/field-name-const

Add const to GetName functions

backend - add const to QF name acessor

rust - drop redundant import

interface - add const to GetName functions

Merge pull request #1483 from CEED/jeremy/use-getters

Reduce reaching into private data

qf/op - add QFunction/OperatorFieldGetData

internal - reduce reaching into private structs

Merge pull request #1482 from CEED/zach/operator-is-at-points

Add `CeedOperatorIsAtPoints`

Use `CeedOperatorIsAtPoints` instead of private data member

Merge pull request #1484 from CEED/jeremy/qf-flops

Should error when trying to use QF flops, not retrieve

internal - should error when trying to use QF flops, not retrieve

Add `CeedOperatorIsAtPoints`