Add back slash before # in flags to avoid GitHub auto link feature

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Description

codecov pr comments will include flags with # prefix. When using pure number as flag, it will be something like #36 and github may consider it’s referring another pr or issue.

Steps to Reproduce

Upload coverage report with flag 1 and 2

Create a pr

Flags is “auto-link-ed” to another issue or pr

Thanks here @Trim21, we’ll take a look into applying a fix.