fix(tools/looker): log request/response traces at debug, not error

[anxkhn]

Description

The looker-get-dashboards and looker-generate-embed-url tools log their
routine "Making request" / "Got response" traces with logger.ErrorContext,
while every other Looker tool logs the same kind of trace with
logger.DebugContext. StdLogger routes Error to stderr, and these two tools
emit the trace on every successful call, so normal, healthy operation produces
ERROR-severity stderr lines: log spam, and false positives for anyone running
log-based alerting. At the default log level the corrected DebugContext lines
are suppressed entirely.

This switches the four calls to DebugContext so they match the package
convention and are debug-only. The looker-get-dashboards function already logs
the response elements at debug one line later, so the edited lines now match
their own surroundings. Message strings are unchanged; this is purely a severity
fix.

PR Checklist

• Make sure you reviewed
  CONTRIBUTING.md
• Make sure to open an issue as a
  bug/issue
  before writing your code -- not opened: this is a small, self-contained
  severity fix. Happy to file one if you'd prefer.
• Ensure the tests and linter pass -- gofmt, go vet, go build ./...,
  and go test -race on internal/tools/looker/lookergetdashboards,
  internal/tools/looker/lookergenerateembedurl, and internal/log all pass.
• Code coverage does not decrease -- no behavioral seam changed; the logging
  contract (Debug routes to the out stream and is suppressed at the default
  level; Error routes to the err stream) is already covered by
  internal/log/log_test.go (TestStdLogger).
• Appropriate docs were updated -- none needed.
• Make sure to add ! if this involves a breaking change -- not a breaking
  change.

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[gemini-code-assist]

Code Review

This pull request updates the logging level in Looker tools (lookergenerateembedurl and lookergetdashboards) from Error to Debug when logging requests and responses. This prevents polluting the error logs with standard operational messages. There are no review comments, and I have no additional feedback to provide.

[NoClueMike]

The Looker Cover Up...

[drstrangelooker]

/gcbrun

[drstrangelooker]

@anxkhn please sign the CLA and we should be good to go.

[anxkhn]

@googlebot rescan

[anxkhn]

@drstrangelooker I am trying to re trigger cla, looks like I will have to use my @gmail.com which I signed cla with and cannot use 83116240+anxkhn@users.noreply.github.com. Still new to this. Sorry for unnecessary notifications.