[SVLS-7945] feat: Support TLS certificate for dogstatsd metrics flusher (#984)

## Motivation
A customer reported that their Lambda is behind a proxy, and the
Rust-based extension encounters an error when sending logs and metrics
to Datadog via the proxy.

## Overview

Previous PRs in fixed this for traces/stats
(#961) and
logs/proxy
(#979).
DataDog/serverless-components#61 in
`serverless-components` repo fixed this issue for dogstatsd metrics.
This PR upgrades the dependency on `serverless-components` to patch this
update.

## Testing 
#### Steps
See #979

#### Result
**Before:**
Metrics flushing failed:
> DD_EXTENSION | DEBUG | Flushing 0 series and 1 distributions
DD_EXTENSION | DEBUG | Sending distributions: SketchPayload { ... }
DD_EXTENSION | DEBUG | Request to
https://api.datadoghq.com/api/beta/sketches took 144ms
DD_EXTENSION | ERROR | Error shipping data: None Failed to send request
after 3 attempts
DD_EXTENSION | ERROR | Failed to flush some metrics due to shipping
errors: 0 series and 1 sketches

**After:**
Metrics flushing succeeded:
> DD_EXTENSION | DEBUG | Flushing 0 series and 1 distributions
DD_EXTENSION | DEBUG | Sending distributions: SketchPayload { ... }
DD_EXTENSION | DEBUG | Request to
https://api.datadoghq.com/api/beta/sketches took 619ms
DD_EXTENSION | DEBUG | Successfully flushed 0 series and 1 distributions

## Notes
Customer report issue:
#919

Author: lym953

bottlecap/Cargo.lock

@@ -71,8 +71,8 @@ libdd-trace-utils = { git = "https://github.com/DataDog/libdatadog", rev = "73c6
 libdd-trace-normalization = { git = "https://github.com/DataDog/libdatadog",  rev = "73c675b79f81978ee1190be6af0c5abec997e3b0" }
 libdd-trace-obfuscation = { git = "https://github.com/DataDog/libdatadog", rev = "73c675b79f81978ee1190be6af0c5abec997e3b0"  }
 libdd-trace-stats = { git = "https://github.com/DataDog/libdatadog", rev = "73c675b79f81978ee1190be6af0c5abec997e3b0"  }
-dogstatsd = { git = "https://github.com/DataDog/serverless-components", rev = "fd8b7a9bcec2f19b305bb74b7195ca3910538e5b", default-features = false }
-datadog-fips = { git = "https://github.com/DataDog/serverless-components", rev = "fd8b7a9bcec2f19b305bb74b7195ca3910538e5b", default-features = false }
+dogstatsd = { git = "https://github.com/DataDog/serverless-components", rev = "18b49baba8bfef97060d7edd8b830584d0da3373", default-features = false }
+datadog-fips = { git = "https://github.com/DataDog/serverless-components", rev = "18b49baba8bfef97060d7edd8b830584d0da3373", default-features = false }
 libddwaf = { version = "1.28.1", git = "https://github.com/DataDog/libddwaf-rust", rev = "d1534a158d976bd4f747bf9fcc58e0712d2d17fc", default-features = false, features = ["serde"] }
 
 [dev-dependencies]

bottlecap/Cargo.toml

@@ -1622,6 +1622,7 @@ fn start_metrics_flushers(
         aggregator_handle: metrics_aggr_handle.clone(),
         metrics_intake_url_prefix: metrics_intake_url.expect("can't parse site or override"),
         https_proxy: config.proxy_https.clone(),
+        ca_cert_path: config.tls_cert_file.clone(),
         timeout: Duration::from_secs(config.flush_timeout),
         retry_strategy: DsdRetryStrategy::Immediate(3),
         compression_level: config.metrics_config_compression_level,
@@ -1651,6 +1652,7 @@ fn start_metrics_flushers(
                 aggregator_handle: metrics_aggr_handle.clone(),
                 metrics_intake_url_prefix: metrics_intake_url.clone(),
                 https_proxy: config.proxy_https.clone(),
+                ca_cert_path: config.tls_cert_file.clone(),
                 timeout: Duration::from_secs(config.flush_timeout),
                 retry_strategy: DsdRetryStrategy::Immediate(3),
                 compression_level: config.metrics_config_compression_level,

bottlecap/src/bin/bottlecap/main.rs

@@ -52,6 +52,7 @@ async fn test_enhanced_metrics() {
         metrics_intake_url_prefix: MetricsIntakeUrlPrefix::new(None, Some(metrics_site_override))
             .expect("can't parse metrics intake URL from site"),
         https_proxy: None,
+        ca_cert_path: None,
         timeout: std::time::Duration::from_secs(5),
         retry_strategy: dogstatsd::datadog::RetryStrategy::Immediate(1),
         compression_level: 6,