[Fix] display-name: fix false positive for HOF returning only nulls and literals

[golopot]

Fixes #3300.

This bug is caused by #3276.

Stop considering the following a component:

const f = (a) => () => {
  if (a) {
    return null;
  }
  return 1;
};

The bug is triggered when a literal like 1 or "a" is returned somewhere.

[codecov]

Codecov Report

Merging #3305 (8e4d17a) into master (6b330b8) will decrease coverage by 0.23%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3305      +/-   ##
==========================================
- Coverage   97.73%   97.49%   -0.24%     
==========================================
  Files         123      123              
  Lines        8862     8861       -1     
  Branches     3239     3238       -1     
==========================================
- Hits         8661     8639      -22     
- Misses        201      222      +21     

Impacted Files	Coverage Δ
lib/util/Components.js	96.48% <ø> (-2.49%)	⬇️
lib/rules/no-unstable-nested-components.js	94.76% <0.00%> (-3.49%)	⬇️
lib/util/jsx.js	92.30% <0.00%> (-3.30%)	⬇️

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[ljharb]

Looks like after a rebase, there's some tests failing.

[golopot]

I have rebased the PR and removed some tests from the incoming commits.