feat: add update-condition for github-comment exec

[ponkio-o]

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I have added --update-conditon to exec sub-command so that existing comments can be overwritten. post implementation as a reference (PR: https://github.com/suzuki-shunsuke/github-comment/issues/473)

related:

• https://github.com/suzuki-shunsuke/github-comment/discussions/972
• https://github.com/suzuki-shunsuke/github-comment/issues/473

[ponkio-o]

🤔

Error: pkg/api/exec.go:217:1: calculated cyclomatic complexity for function getComment is 11, max is 10 (cyclop)
func (c *ExecController) getComment(execConfigs []*config.ExecConfig, cmtParams *ExecCommentParams, templates map[string]string) (*github.Comment, bool, error) { //nolint:funlen

[ponkio-o]

@suzuki-shunsuke What do you think? We are using github-comment exec heavily in many repositories on work, so I want to use this feature.

[suzuki-shunsuke]

Sorry, I'll take a look this weekend. Honestly, I'm not a fan of updating comments, but I understand that this feature is necessary for some users like you.