Rename BuilderName to Name

[martintmk]

Details on the issue fix or feature implementation

The Builder is redundant as it's clear because we are in ResilienceStrategyBuilder class.

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have successfully run a local build

[codecov]

Codecov Report

Merging #1437 (44639f0) into main (7dc06c0) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1437   +/-   ##
=======================================
  Coverage   83.92%   83.92%           
=======================================
  Files         276      276           
  Lines        6524     6524           
  Branches     1006     1006           
=======================================
  Hits         5475     5475           
  Misses        840      840           
  Partials      209      209           

Flag	Coverage Δ
linux	?
macos	83.92% <100.00%> (ø)
windows	83.92% <100.00%> (ø)

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Files Changed	Coverage Δ
.../Polly.Core/Registry/ResilienceStrategyRegistry.cs	100.00% <100.00%> (ø)
src/Polly.Core/ResilienceStrategyBuilderBase.cs	100.00% <100.00%> (ø)
...ry/TelemetryResilienceStrategyBuilderExtensions.cs	100.00% <100.00%> (ø)