fix: add missing autocomplete attributes to identifier_first strategy

[jonas-jonas]

AFAICT, this setup adds proper support for password managers to the strategy. Though different PW managers and browsers handle this attribute differently, and it's not well documented what best to do. This combination is the only one that worked reliably.

Related issue(s)

Checklist

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• I have referenced an issue containing the design document if my change
  introduces a new feature.
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Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.56%. Comparing base (82660f0) to head (5b67f25).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4215      +/-   ##
==========================================
+ Coverage   78.54%   78.56%   +0.01%     
==========================================
  Files         380      380              
  Lines       27225    27229       +4     
==========================================
+ Hits        21384    21392       +8     
+ Misses       4218     4216       -2     
+ Partials     1623     1621       -2     

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