chore: fix spelling across comments, identifiers and query tags

[NickJosevski]

Replaces #204, which had gone stale and conflicting. Same corrections, rebased onto main, with @jsoref credited as co-author.

Mostly comments and local identifiers, but three are behaviour, not spelling:

• pkg/events/events_query.go — Internal was tagged uri:"interal". The server's link template is /api/events{?...,internal,...}, so the tag never matched and the filter silently expanded to nothing. Confirmed against a live instance. Same class as Feat: Add GetDashboard for the non-dynamic dashboard endpoint #442, [BUG] ReleaseTemplateGitResource.GitCredentialId has the wrong JSON tag and never deserialises #443 and [BUG] DeploymentProcessService.Get returns an empty process and a nil error when the project's Links are unpopulated #444. Callers that set Internal were getting unfiltered results and will now get filtered ones.
• pkg/interruptions/interruption.go — ManualInterverventionApprove is exported, so chore: Spelling #204's outright rename would have been breaking. Added ManualInterventionApprove and kept the misspelling as a deprecated alias instead.
• uritemplates/uritemplates.go:188 — the parseTerm error text changes from "both explode and prefix modifers on same term" to "...modifiers...". It's an internal URI-template parse error, but the string is observable to anyone matching on the message, so it belongs in the release notes rather than being filed under comment fixes.

Not breaking

No compile-level break. ManualInterverventionApprove survives as an alias with the same value, and every other renamed identifier is a doc comment, a local variable, a commented-out test, or — in pkg/machines/ssh_endpoint.go — a field on the anonymous struct declared inside MarshalJSON, whose json tag was already correct. Nothing changes on the wire.

Note on api/spec.json

DeploymentPromomotionTenant → DeploymentPromotionTenant matches how the server actually spells it. The DefaultParamterValueMissing → DefaultParameterValueMissing hunk is more debatable: that's a wire enum value on ActionUpdateResultResource, and a live server still emits the misspelling, so the "fix" makes the checked-in spec diverge from reality. Nothing in this repo reads spec.json, so it can't break a build — flagging it for a reviewer to call.

Omitted

Deliberately left out of #204's set: pkg/machines/duration_formatter_test.go (fourtySevenHours). #435 rewrites that file, and touching it here would only create a conflict — worth picking up after that merges.

Two stray .DS_Store files that had been committed are removed, and .DS_Store is now in .gitignore.

Verification

go build, go vet and gofmt clean, and api/spec.json still parses. (uritemplates/uritemplates.go is unformatted per gofmt, but identically so on main — a trailing // in the package doc comment, untouched here.) The full pkg/... suite has the same failures before and after this change — all integration tests against a live instance, and the set varies between consecutive runs on main alone.

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