Remove all config deprecations invalidated in 0.91

[rohankapoorcom]

Description:

In release 0.88, we deprecated the following items:

• CONF_UPDATE_INTERVAL in the configuration of all components (Deprecate conf_update_interval #20924)
• ATTR_TARGET in the configuration of tplink_lte (Use CONF_RECIPIENT for default recipient in config #20925)

Per their configuration at deprecation time, users using the old configuration would have had warning logs until 0.91 when the configuration would be invalidated. Since we release 0.91 today, we are now able to clean up and remove these from the code base.

This is not a breaking change because the deprecation config validator would have already broken the configurations with the release of 0.91 and we announced the breaking change as part of 0.88.

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.

[codecov]

Codecov Report

Merging #22704 into dev will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##              dev   #22704   +/-   ##
=======================================
  Coverage   93.83%   93.83%           
=======================================
  Files         449      449           
  Lines       36568    36568           
=======================================
  Hits        34314    34314           
  Misses       2254     2254

Impacted Files	Coverage Δ
homeassistant/components/darksky/sensor.py	97.72% <100%> (ø)	⬆️

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