fix(explore): Correctly parse variadic field and environment flags

[sentry]

This PR addresses CLI-2B4 by correcting the parsing logic for the field and environment flags in the explore command.

Previously, these variadic flags were defined with parse: String. When multiple values were provided (e.g., --field foo --field bar), the stricli parser would call String() on the collected array of strings. This resulted in the array being coerced into a single comma-separated string (e.g., "foo,bar"), rather than remaining a string[].

Downstream code, such as fieldList.find(), then attempted to call array methods on this string, leading to a TypeError: e.find is not a function.

The fix changes the parse function for both field and environment flags from String to (v: string[]) => v. This ensures that when multiple values are provided, the parser correctly returns the array of strings, preserving the expected type for subsequent operations.

Fixes CLI-2B4

_{Comment @sentry <feedback> on this PR to have Autofix iterate on the changes.}

[github-actions]

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[github-actions]

Codecov Results 📊

❌ Patch coverage is 0.00%. Project has 5496 uncovered lines.
✅ Project coverage is 81.75%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
src/commands/explore.ts	0.00%	⚠️ 2 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
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+ Coverage    81.75%    81.75%        —%
==========================================
  Files          428       428         —
  Lines        30106     30108        +2
  Branches     19593     19593         —
==========================================
+ Hits         24611     24612        +1
- Misses        5495      5496        +1
- Partials      2054      2056        +2

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