Skip delete for SDK summary and deps file

[natebosch]

Fixes #2995

When the summary file is determined to be invalid, regenerate it and
overwrite it without deleting. This resolves a race condition where
multiple resolvers could try to delete the same file. The invalid
content will not be read, because we will regenerate the file before
moving on to the rest of the build.

[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:build_resolvers	2.3.2	ready to publish	build_resolvers-v2.3.2
package:build_daemon	4.0.1-dev	pre-release version (no publish necessary)
package:scratch_space	1.0.2	already published at pub.dev
package:build	2.4.1	already published at pub.dev
package:build_config	1.1.2-dev	pre-release version (no publish necessary)
package:build_modules	5.0.4	already published at pub.dev
package:build_web_compilers	4.0.5	already published at pub.dev
package:build_runner_core	7.2.11-dev	pre-release version (no publish necessary)
package:build_runner	2.4.7-dev	pre-release version (no publish necessary)
package:build_test	2.2.1-dev	pre-release version (no publish necessary)

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.