Find alternative for `time.sleep` in link replacement function

[MizukiTemma]

Motivation

Currently we use time.sleep in replace_links and LinkcheckListView to wait the link replacement procedure to be finished. However this is not so reliable and causes unnecessary waiting time.

Proposed Solution

Find an alternative way to ensure the link replacement procedure is completed without causing unnecessary waiting time.

Alternatives

Leave it as it is.

User Story

Additional Context

See this comment for more context.

Design Requirements