Update RELEASE to v0.49.2 and sync docs of v0.49.x

[t-kikuc]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[github-actions[bot]]

The following 1 GitHub releases will be created once this pull request got merged.

Release v0.49.2 with changes since v0.49.1

Internal Changes

• Update RELEASE to v0.49.2 and sync docs of v0.49.x
• Enabled to configure the interval of livestate store for Lambda (#5269)
• Remove pipectl quickstart command (#5268)
• Update quickstart manifests (#5267)
• Fix the workflow publishes quickstart manifests (#5266)
• Update release docs (#5264)
• Cherry-pick #5240 #5241 #5248 #5249 #5254 #5255 #5256 #5258 #5260 #5262 #5263 (#5265)
• Update RELEASE to v0.49.1 and update v0.49.x docs (#5263)
• Update workflow not to run by matrix (#5262)
• Update quickstart README (#5261)
• Add workflow steps to build and publish quickstart manifests (#5260)
• Implement DetermineVersions of k8s plugin (#5257)
• Support directly designating a gitSSHKey instead of File for launcher (#5258)
• Revert "Copy platform provider kubernetes under the plugin directory (#5250)" (#5253)
• Remove subnet ordering in head manifest (#5254)
• Update quickstart header note (#5255)
• Update feature status (#5256)
• Copy platform provider kubernetes under the plugin directory (#5250)
• Support fetching a piped config from AWS SSM Parameter Store (#5249)
• Add test for k8s plugin's toolregistry (#5246)
• Remove an unused field 'configFilePathInGitRepo' (#5248)
• Update web development readme (#5247)
• Add test for pipedv1's buildPlan method, and remove platform specific config from configv1's GenericApplicationConfig (#5238)
• [bot] Update contributors (#5245)
• Upgrade aws-sdk-go-v2 (#5241)
• Add k8s plugin's toolregistry implementation (#5243)
• Use index from requests in buildQuickSyncPipeline (#5242)
• Add requires for stages in case of multi plugins quicksync pattern (#5239)
• Fix panic in ECS driftdetection when a taskdef in livestates does not exist (#5240)
• Copy pkg/config to pkg/configv1 (#5237)
• Mark PipelineStage.Predefined as deprecated field (#5236)
• Add PipelineStage.Rollback and mark PipelineStage.Visible as deprecated (#5232)
• [docs] Remove AWS App Mesh from feature status (#5234)
• [docs] Rearrange the core values on the top page (#5233)
• Add toolregistry client as DeploymentService member (#5228)
• Send StageIndex to plugins (#5231)
• Sort the rollbackStages to fix the flaky tests (#5230)
• Add stage_index field at BuildQuickSyncStagesRequest (#5229)
• Add test for buildQuickSyncPipeline (#5227)
• Add InstallTool RPC method for PluginService (#5218)
• Add OpenSSF best practices badge to README (#5226)
• Implement k8s plugin's FetchDefinedStages and BuildQuickSyncStages (#5223)
• Modify spec for multi cluster deployment (#5219)
• Use make release for major/minor releases (#5225)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 24.28%. Comparing base (f38cd84) to head (dc79f43). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5272 +/- ## ========================================== + Coverage 24.26% 24.28% +0.01% ========================================== Files 440 440 Lines 46754 46754 ========================================== + Hits 11346 11352 +6 + Misses 34505 34499 -6 Partials 903 903 ```

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