doc - update description of #pragma once

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

doc - mention jit #pragma once

jit - fix path cleaning logic

jit - clean source paths before storing list

Drop JiT Guards in Most QF Source (#1540)

* backend - use pragma once

* gallery - drop source header guards

* ex - drop some qfunction source header guards

* fluids - drop guards on all sin

Drop JiT Guards in Most QF Source (#1540)

* backend - use pragma once

* gallery - drop source header guards

* ex - drop some qfunction source header guards

* fluids - drop guards on all singly included headers

* jit - drop most guards on backend JiT files

* sycl - drop extra header guards

* jit - enable #pragma once for QF source

* fluids - use #pragma once for util/helper qf source

* test - check different multiple includes

* fluids - fix odd include

* jit - update interface for building JiT string from multiple files

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Merge pull request #1541 from CEED/jeremy/trim-smartsim

Drop SmartSim test on ROCm

ci - drop SmartSim test on ROCm

Merge pull request #1538 from CEED/jeremy/fluids-int64

Enable int64 testing for PETSc examples

ex - enable int64 testing for PETSc examples, small fixes for compatibility

Merge pull request #1537 from CEED/jeremy/pragma-once

Use #pragma once for non-JiT headers

minor - update copyright headers

ex - use #pragma once in examples

headers - use #pragma once for non-JiT headers

Merge pull request #1534 from CEED/jeremy/no-repeat-file

Only include each JiT source once

Merge pull request #1536 from CEED/jeremy/tidy-fix

tidy - fix argument name mismatch

tidy - fix argument name mismatch

Merge pull request #1535 from CEED/balin/smartsim

Fixed SSDB issue with SmartSim Regression Test

fluids: fixed DDSB issue with smartsim unit test

jit - only include each source once

Merge pull request #1495 from CEED/jeremy/at-points-diagonal

Diagonal Assembly Clarification for AtPoints

Merge pull request #1521 from CEED/jeremy/cov-fixes

Reduce Code Duplication

fix - update error message

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

pc - add switch for AtPoints diagonal assembly

pc - internal function naming consistency

Merge pull request #1530 from CEED/jrwrigh/matceed_errors

Fluids/MatCeed: Print lengths in PetscChecks