Remove the embedded source to avoid self-matching in slang-test (#8305)

When `SIMPLE` type test is used with `-g[1-3]` option, the filecheck
pattern will most likely to match to the string itself on the embedded
source code rather than match to the emitted spirv-asm code.

This commit avoids the problem by removing the embedded source code.

This commit also provides an option to keep the embedded source code,
`-preserve-embedded-source`.

The source code removal is happening in two steps:
1. iterate all output lines and find SPIRV-ASM in the following pattern:
`%N = OpExtInst %void %M DebugSource %fileId %sourceId`. And then, store
the "%sourceId" value to identify which SPIRV instructions are for the
embedded source code.
2. iterate all output lines again to find the `%sourceId = OpString
"...."` and replace the whole string with the following string, ``` %1 =
OpString "// slang-test removed the embedded source // Use
`-preserve-embedded-source` to keep it explicitly " ```

This change revealed problems in the existing tests:
- tests/bugs/spirv-debug-info.slang : The expected text was missing and
it had to be added. The file also had Carrage-Return character on all
lines and the pre-commit git hook removed them.
- tests/spirv/debug-info.slang : the expected keyword DebugValue had to
change to DebugDeclare, because that's what we get with ToT.
- tests/spirv/debug-value-dynamic-index.slang : This test is currently
failing, and it will pass once DebugLocalVariable instruction missing
for parameter of the entry point function #7693 is resolved.

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Co-authored-by: slangbot <ellieh+slangbot@nvidia.com>

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