Part of https://github.com/Azure/azure-sdk-for-cpp/issues/1277, checking what types of warnings the CI emits.
Verified all SDK product `.cpp`, `.hpp`, `.txt`, and `.md` files, primarily focused on azure-core. They are all clean now. There are some exceptions that needs to be added for keyvault and storage, but they are false positives, so not a concern.
> `cspell lint --config .vscode/cspell.json *.hpp */**/*.hpp`
CSpell: Files checked: 188, Issues found: 0 in 0 files
> `cspell lint --config .vscode/cspell.json *.cpp */**/*.cpp`
CSpell: Files checked: 186, Issues found: 88 in 15 files (keyvault and storage false positives, or tests)
> `cspell lint --config .vscode/cspell.json *.md */**/*.md`
CSpell: Files checked: 45, Issues found: 5 in 2 files (eng/common)
> `cspell lint --config .vscode/cspell.json *.txt */**/*.txt`
CSpell: Files checked: 44, Issues found: 0 in 0 files
> `cspell lint --config .vscode/cspell.json *.* */**/*`
CSpell: Files checked: 646, Issues found: 328 in 69 files (most of these are in eng\docs\api\assets\style.css or eng/common)
Deprioritize and ignored the errors from the test files (including test resource json files), and `eng/common` since those need to be centrally fixed.
