Update lock icon

[acelaya]

Part of hypothesis/product-backlog#1597

In preparation to add icons for group types, this PR updates the lock icon to the one used in the group types designs, which is also intended to replace the existing lock icon.

Before:

After:

The lock icon was only used in a couple places in client. This is how the old vs new icons look.

Private annotation: Before vs after

☝🏼 This requires a few tailwind classes adjustments

Only for me: Before vs after

Share tab: Before vs after

☝🏼 This requires a few tailwind classes adjustments

Additionally, this PR deprecates the lock-alt and lock-alt-filled icons, which we don't seem to be using anywhere.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (89498a0) to head (91d4822).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1774   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           67        67           
  Lines         1204      1204           
  Branches       455       455           
=========================================
  Hits          1204      1204           

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