sycl - use switch for enums

minor - reduce LCOV_EXCL markers

internal - more updates for const

sycl: resolve const variance

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()?;

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backend - add const to QF name acessor

rstr - fix signature of GetLayout

rstr - add CeedElemRestriction[Get,Set]LLayout

Merge pull request #1457 from argonne-lcf/kris/sycl-ref-slm-pointers

Replace calls to deprecated `local_accessor::get_pointer()`

Address PR feedback: Remove dead code

Operator full assembly and diagonal assembly for cuda-ref and hip-ref backends for H(div) and H(curl) elements

Initial commit for cuda-ref and hip-ref backend support for oriented and curl-oriented element restrictions

For now, the element restriction transpose for oriented or curl-oriented cases is always n

Initial commit for cuda-ref and hip-ref backend support for oriented and curl-oriented element restrictions

For now, the element restriction transpose for oriented or curl-oriented cases is always non-deterministic.

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Replace calls to deprecated `local_accessor::get_pointer()`

Non-square operator full assembly (#1316)

* Consistency formatting for operator tests

* Add (failing) test for non-square operator full assembly

* Add support for CPU-based full assembly of no

Non-square operator full assembly (#1316)

* Consistency formatting for operator tests

* Add (failing) test for non-square operator full assembly

* Add support for CPU-based full assembly of non-square CeedOperators

* Fix full assembly of identity quadrature functions and operators with CEED_BASIS_NONE

Also adds a unit test for full assembly which fails prior to the changes in this commit.

* Minor refactor to improve coverage

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Enforce consistent pointer alignment with clang-format

Fix some missing consistency issues from #1315

style - spell rstr consistently

style - fixes for SYCL backends

Co-authored-by: James Wright <james@jameswright.xyz>

Merge pull request #1321 from CEED/jeremy/vec-bug

gpu - fix SetArray on device logic bug

Fix a few header includes following PR #1320

gpu - fix SetArray on device logic bug

op - update return value convention for CeedOperatorGetFallbackParentCeed

op - clarify op fallback parent interface

Interface consistency fixes (#1312)

* format - consistency fixes

* format - test name consistency

* format - drop comma operator

* format - drop git add . in favor coercion

* format - ad

Interface consistency fixes (#1312)

* format - consistency fixes

* format - test name consistency

* format - drop comma operator

* format - drop git add . in favor coercion

* format - add CeedScalarSwap macro

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Minor formatting consistency for SYCL backend files