Include number of files in snippet lists

Based on #213641 (closed) and #215008 (comment 327367990), we might want the number of files stored in the repository in order to show them to the user.

Each snippet has a matching SnippetStatistics object. This object includes some information about the repository, like the number of commits, size, and file count.

We could get the file_count from SnippetStatistics and show it in the snippet list.

We should tweak the query in the controller in order to "join" the SnippetStatistics and avoid N+1.

Proposal

• Add file count and file icon svg in right area
• On hover, tooltip displays {file count} files

Availability and Testing

Please run package-and-qa to ensure existing tests still pass. Test coverage to be expanded to include file count as part of gitlab-org/quality/testcases#1707 (closed) (DRI: @a_mcdonald)

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