Changes for release v6.1.0

[lpatino10]

This PR contains changes that will be included in release v6.1.0.

The main changes are the addition of Language Translator v3 and API diff tool fixes, along with regular codegen updates.

Those codegen updates use the following commits:

• API Definition: a3d247f2d250edf5b9743a41afcfebda52f66cf4
• Codegen: 1b4341039c46d6794f65a12932698cb7aeb1c236

[codecov-io]

Codecov Report

Merging #951 into master will decrease coverage by 26.41%.
The diff coverage is 52.65%.

@@              Coverage Diff              @@
##             master     #951       +/-   ##
=============================================
- Coverage     65.46%   39.05%   -26.42%     
+ Complexity     2655     1470     -1185     
=============================================
  Files           564      580       +16     
  Lines         14396    14675      +279     
  Branches        824      840       +16     
=============================================
- Hits           9425     5731     -3694     
- Misses         4550     8610     +4060     
+ Partials        421      334       -87

Impacted Files	Coverage Δ	Complexity Δ
...r_cloud/speech_to_text/v1/model/LanguageModel.java	28.57% <ø> (-7.15%)	3 <0> (-1)
...loud/discovery/v1/model/FederatedQueryOptions.java	34.45% <ø> (ø)	17 <0> (ø)	⬇️
.../conversation/v1/model/UpdateWorkspaceOptions.java	87.35% <ø> (-5.75%)	10 <0> (-3)
...ud/discovery/v1/model/CreateExpansionsOptions.java	52.77% <ø> (ø)	4 <0> (ø)	⬇️
...veloper_cloud/assistant/v1/model/CreateEntity.java	28.57% <ø> (-19.05%)	1 <0> (ø)
..._cloud/tone_analyzer/v3/model/ToneChatOptions.java	43.75% <ø> (ø)	4 <0> (ø)	⬇️
...developer_cloud/tone_analyzer/v3/ToneAnalyzer.java	51.21% <ø> (ø)	4 <0> (ø)	⬇️
..._cloud/assistant/v1/model/UpdateEntityOptions.java	75.92% <ø> (-24.08%)	6 <0> (-3)
...oud/conversation/v1/model/UpdateIntentOptions.java	84.09% <ø> (-15.91%)	6 <0> (-1)
...loud/conversation/v1/model/CreateValueOptions.java	86.88% <ø> (-13.12%)	8 <0> (-1)
... and 408 more

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[mediumTaj]

👍 looks good!